Tuohy v. Groton , 331 Conn. 745 ( 2019 )


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    JOHN P. TUOHY ET AL. v. TOWN OF GROTON ET AL.
    (SC 20019)
    Robinson, C. J., and Palmer, McDonald, D’Auria,
    Mullins, Kahn and Ecker, Js.*
    Syllabus
    The plaintiffs, owners of certain properties located in a particular residential
    neighborhood in the town of Groton, appealed to the trial court pursuant
    to statute (§ 12-119), seeking a reduction in the assessments to their
    properties resulting from a townwide revaluation conducted by the
    defendants, the town and its assessor. The plaintiffs’ properties are
    each located in a planned community with exclusive access to certain
    amenities including a beach and a restaurant. The town hired T Co.,
    a certified mass appraisal vendor, to assist with the revaluation. In
    connection with the revaluation, T Co.’s employees went to each prop-
    erty to gather information. T Co. also sought to confirm the physical
    characteristics of each property through individualized mailings. Once
    the information collected was entered into a database used to generate
    property values, T Co. produced a preliminary property record and
    sent its employees to each property again to ensure accuracy. T Co.
    subsequently conducted a preliminary ratio test, which involved compar-
    ing the median sale price resulting from certain arm’s-length transactions
    and the median total value for the properties in the plaintiffs’ neighbor-
    hood, which already reflected an adjustment factor that had been applied
    in the preceding revaluation. T Co. determined that the resulting median
    assessment to sales ratio for the plaintiffs’ neighborhood fell outside of
    the acceptable range, and, consequently, T Co. and the town concluded
    that an increase in the adjustment factor was appropriate and necessary
    to bring the assessed values of the properties in the plaintiffs’ neighbor-
    hood closer to fair market values. In challenging the defendants’ assess-
    ments, the plaintiffs claimed, inter alia, that the defendants’ uniform
    application of the adjustment factor to increase the assessed values of
    all of the properties in their neighborhood without further individualized
    consideration of each property violated § 12-119. The trial court con-
    cluded that the defendants’ uniform application of the adjustment factor
    to the properties in the plaintiffs’ neighborhood did not violate § 12-
    199, rejected the plaintiffs’ argument that the defendants had disregarded
    a legal duty by applying ratio testing standards to specific neighbor-
    hoods, and credited testimony from both the assessor and T Co.’s project
    supervisor that the purpose of the higher adjustment factor was to adjust
    the assessments in order to bring them closer to fair market values.
    The trial court accordingly rendered judgment in favor of the defendants,
    from which the plaintiffs appealed. Held that the plaintiffs could not
    prevail on their claim that they were entitled to tax relief under § 12-
    119, this court having concluded that the defendants’ uniform application
    of the adjustment factor to the properties in the plaintiffs’ neighborhood
    was not illegal: although the plaintiffs’ correctly observed that townwide
    ratio testing is required by regulation (§ 12-62i-3) prior to finalizing a
    reevaluation, reading that regulation to preclude the use of ratio testing
    or the application of adjustment factors specific to particular neighbor-
    hoods during the mass appraisal process would require reading addi-
    tional language into its text, would be inconsistent with text in related
    regulations, and would conflict with another regulatory provision (§ 12-
    62f-4 [d]) that specifically contemplates such testing by neighborhood;
    moreover, the defendants’ use of a ratio study and direct equalization
    via an adjustment factor, as applied to a specific neighborhood, during
    the mass appraisal process was supported by appraisal standards set
    forth in various publications from professional associations, including
    the Appraisal Standards Board of the Appraisal Foundation and the
    International Association of Assessing Officers; furthermore, certain
    data presented at trial demonstrating a decrease in home sales prices
    in the plaintiffs’ neighborhood in the years preceding the revaluation
    were insufficient to establish illegality in the absence of evidence of the
    defendants’ misfeasance or malfeasance, and the plaintiffs failed to
    prove that the adjustment to the appraised value of their properties
    actually resulted in a manifest overvaluation of those properties relative
    to true and actual fair market values.
    Argued November 16, 2018—officially released May 28, 2019
    Procedural History
    Appeal from tax assessments relating to certain resi-
    dential property owned by the plaintiffs, brought to the
    Superior Court in the judicial district of New London,
    and transferred to the judicial district of New Britain,
    where the court, Cohn, J., granted the plaintiffs’ motion
    for class certification; thereafter, the case was trans-
    ferred to the judicial district of Hartford and tried to
    the court, Moll, J.; judgment for the defendants, from
    which the plaintiffs appealed. Affirmed.
    Linda L. Morkan, with whom was John F.X. Peloso,
    Jr., for the appellants (plaintiffs).
    Eileen Duggan, for the appellees (defendants).
    Opinion
    ROBINSON, C. J. In this appeal, we consider whether
    a municipality’s assessor may apply a uniform adjust-
    ment factor to a neighborhood’s appraised property
    values during the mass appraisal process for the revalu-
    ation of real property pursuant to General Statutes § 12-
    62 (b),1 as a direct equalization measure in order to
    ensure that neighborhood is not undertaxed relative to
    others in the municipality. The plaintiffs, John P. Tuohy
    and numerous other owners of real property located
    in the Groton Long Point neighborhood,2 brought this
    class action tax appeal pursuant to General Statutes
    § 12-1193 against the defendants, the town of Groton
    (town) and Mary Gardner, its assessor, challenging the
    assessed value of their properties following the revalua-
    tion conducted by the town for its October 1, 2011 grand
    list (2011 revaluation). The plaintiffs now appeal4 from
    the judgment in favor of the defendants, rendered after
    a trial to the court, upholding the legality of those
    assessments. On appeal, the plaintiffs claim that the
    trial court incorrectly determined that their assess-
    ments were not manifestly excessive because the defen-
    dants violated § 12-62 and numerous provisions of the
    Regulations of Connecticut State Agencies (regula-
    tions) promulgated by the state Office of Policy and
    Management (OPM); see Regs., Conn. State Agencies
    § 12-62i-1 et seq.; when they applied a flat, undifferenti-
    ated adjustment factor that increased the assessed
    value of all properties in Groton Long Point by 35 per-
    cent without individualized consideration of the unique
    characteristics of each property. We conclude that the
    defendants properly applied an adjustment factor as
    a direct equalization measure in connection with an
    assessment to sales ratio study conducted pursuant to
    various standards promulgated by the International
    Association of Assessing Officers (international associ-
    ation) in order to ensure that Groton Long Point bore
    its fair share of the town’s municipal tax burden relative
    to the town’s other neighborhoods. Accordingly, we
    affirm the judgment of the trial court.
    The record reveals the following facts, as comprehen-
    sively found by the trial court, Moll, J.,5 and procedural
    history. ‘‘The plaintiffs are residential property owners
    in the Groton Long Point . . . neighborhood6 of [the
    town], who, on behalf of themselves and the certified
    class,7 are challenging the [2011 revaluation]. [Groton
    Long Point] is a planned community and comprises
    approximately 600 properties. When someone owns
    property in [Groton Long Point], he or she pays into
    an association and has rights to use certain amenities
    within the community, including the beach, docks,
    piers, and association buildings, which include, among
    other things, a restaurant. In addition, parking in [Gro-
    ton Long Point] requires a permit.
    ‘‘The 2011 revaluation was a mass appraisal, defined
    as ‘the process of valuing a universe of properties as
    of a given date using standard methodology, employ-
    ing common data, and allowing for statistical testing.
    Methodology that is acceptable shall include, but is
    not limited to, automated valuation models, adaptive
    estimation procedure, multiple regression analysis, sta-
    tistical analysis and other generally accepted tech-
    niques . . . .’ Regs., Conn. State Agencies § 12-62i-1
    (10). The 2011 revaluation was overseen by . . . Gard-
    ner . . . whose position as the town assessor began in
    June, 2011. Gardner first worked in the town’s assessor
    office in 1986; she became a certified assessor in 1989.
    The 2011 revaluation was the first revaluation that Gard-
    ner conducted as an assessor.
    ‘‘To assist it with the 2011 revaluation, the town hired
    Tyler Technologies (Tyler), a mass appraisal vendor
    certified by the state to do revaluations. [See General
    Statutes § 12-62 (e)]. The project supervisor from Tyler
    with respect to the 2011 revaluation was Debra Christy
    . . . who also is certified to do revaluations. Christy has
    been employed with Tyler, although not continuously,
    since 1980 and has been involved with revaluations in
    the state of Connecticut since around 1997. Christy had
    some responsibility in the 2006 revaluation of Groton
    but was not the manager. In the 2011 revaluation,
    Christy was responsible for the analysis for the residen-
    tial property class.
    ‘‘The 2011 revaluation commenced in earnest in April,
    2010, at which time Gardner was the assistant assessor
    for the town. In April, 2010, the town issued a press
    release informing the public that a revaluation would
    be underway and that data collectors would be going
    door to door to measure the exteriors of all properties
    and to attempt interior inspection, if allowed. Tyler
    conducted its data collection using data from the 2006
    revaluation and updating it. Because the 2011 revalua-
    tion was a full measure revaluation, Tyler [employees]
    knocked on every door and did an exterior measure-
    ment of every property. To the extent access to the
    interior was not granted, Tyler sent the property owner
    a callback letter to inquire whether the owner would
    make a scheduled appointment for an interior inspec-
    tion. Tyler then prepared and distributed data mailers
    for each property; such data mailers reflected the prop-
    erty’s physical characteristics that would be used in the
    revaluation. Property owners were asked to contact
    Tyler if any information required correction. Any
    changes resulting from the data mailer process were
    inputted into the Computer Assisted Mass Appraisal
    (CAMA) software system, which the town uses for its
    revaluations to generate property values. CAMA is certi-
    fied by the state of Connecticut and is an example of
    an ‘automated valuation model,’ as that phrase is used
    in § 12-62i-1 (10) [of the regulations], which sets forth
    the definition of ‘[m]ass appraisal.’ In CAMA, with
    respect to each property, a value is assigned to the
    land,8 and a value is assigned to any improvements or
    structures using the cost approach (i.e., the cost of
    replacement with an adjustment for depreciation). The
    improvements value comprises a dwelling value and an
    outbuilding value. One arrives at total value by adding
    land value and improvements value.
    ‘‘Tyler then performed a prereview, which involved
    producing all of the property record cards that were in
    the system and having a certified field person go out
    to each property to conduct what Tyler called a ‘wind-
    shield prereview check’ to ensure that the information
    on the cards was accurate.
    ‘‘After all data were collected and corrected during
    the eighteen-month period following the initial press
    release, Tyler engaged in preliminary ratio testing,
    which required compiling a validated sales set (i.e.,
    sales involving actual warranty deeds) using a two year
    lookback period because of the number of sales.9 With
    respect to [Groton Long Point], the sales set contained
    eighteen validated, arm’s-length transactions. Tyler
    compared the median of the sales identified for each
    neighborhood against the median for the total value for
    the neighborhood. A 1:1 ratio, meaning the medians
    are equal, would be considered ideal. Tyler performed
    preliminary ratio testing for each of the thirteen neigh-
    borhoods within the town.10 The same process was fol-
    lowed in 2006.
    ‘‘On October 31 and November 1, 2011, Christy con-
    ducted four computer runs to create values for the
    [Groton Long Point] residential properties using the
    CAMA software. The 2006 revaluation had used an
    adjustment factor of 1.2 (i.e., a 20 percent increase in
    value) in setting the improvement values of the [Groton
    Long Point] properties. Those adjustments were already
    reflected in the CAMA database that Christy used in
    conducting her analyses. Because an adjustment factor
    of 1.2 was used in 2006 with respect to [Groton Long
    Point] improvement values, Christy used that adjust-
    ment factor as a starting point. Application of an adjust-
    ment factor of 1.2 yielded a median assessment to sales
    ratio (ASR)11 of 88.31 percent for [Groton Long Point].
    Christy found this ratio to be outside an acceptable
    range because it fell under 90 percent.12 In this regard,
    Tyler and the town deemed [Groton Long Point] to
    be an outlier. Specifically, in reaching this conclusion,
    Christy relied on the [international association’s]13 prin-
    ciple that, when looking at the level of assessment, if
    market value is 100 percent, the [median] ASR should
    be plus or minus 10 percent around market value.
    Applying an adjustment factor of 1.4 yielded a median
    ASR of 95.08 percent. Applying an adjustment factor of
    1.4 with a waterfront adjustment yielded a median ASR
    of 97.56 percent. Finally, application of an adjustment
    factor of 1.35 yielded a median ASR of 92.03 percent.
    ‘‘Tyler and the town concluded that applying an
    adjustment factor of 1.35 to the dwelling values within
    [Groton Long Point] was appropriate and necessary to
    reach fair market value. Christy reasoned that other
    variables, including a coefficient of dispersion, fell
    within a preferred range to reach uniformity. [Tyler did
    not physically reinspect any of the Groton Long Point
    properties prior to applying the 1.35 adjustment
    factor.]14
    ‘‘Christy conducted sales ratio studies with respect
    to each of the other twelve neighborhoods. Using a 1.0
    factor, each neighborhood’s median ASR landed above
    90 percent (and below 100 percent market value). For
    each of the other neighborhoods, the resulting median
    ASRs were as follows:
    1010—Center Groton 91.80 percent
    1020—City of Groton 92.99 percent
    1021—City of Groton—Eastern 96.43 percent
    1030—Poquonock Bridge 96.28 percent
    1040—Mystic 94.10 percent
    1041—Mystic Village 94.37 percent
    1050—Noank 95.08 percent
    1051—Noank Village 94.69 percent
    1060—Old Mystic 96.46 percent
    1061—Old Mystic—River Road 95.14 percent
    1080—West Pleasant Valley 95.73 percent
    1090—Mumford Cove 94.78 percent
    Because these median ASRs fell above 90 percent,
    and therefore were deemed acceptable, no adjustments
    were made.
    ‘‘Thereafter, Tyler entered into what it called the final
    review phase. Because the town had elected to use ratio
    testing standards, and not procedural testing standards,
    Christy conducted ratio testing to residential property
    townwide to assure satisfaction of the requirements of
    § 12-62i-3 (b) [of the regulations]. Such testing to such
    property class on a townwide basis resulted in those
    criteria being met on the first try. Therefore, no further
    analysis was performed pursuant to § 12-62i-3 (c). The
    town subsequently submitted to [OPM] the statutorily
    required certification of compliance, which was signed
    by Christy and Gardner and which reflected that the
    town utilized ratio testing standards.’’15 (Footnotes
    added and in original.)
    The plaintiffs subsequently brought this class action
    pursuant to § 12-119, seeking reduction of the assess-
    ments on the relevant properties in Groton Long Point.
    The plaintiffs claimed, inter alia, that the ‘‘uniform appli-
    cation of the 1.35 adjustment factor to residential build-
    ings’’ violated § 12-119 because (1) ‘‘the application of
    a fixed percentage factor to increase assessments with-
    out making any allowance for individual differences in
    properties has been widely condemned by the courts of
    this state,’’ (2) ‘‘the basic deficiency of such a valuation
    procedure is the failure to consider all of the elements
    which may reasonably affect the value of the property,’’
    (3) ‘‘the assumption that residential buildings in Groton
    Long Point are worth 35 percent more than comparable
    structures elsewhere in the town, including but not
    limited to structures in the sections of town classified
    as Mumford Cove, Mystic Village, and Noank Village,
    is arbitrary, unreasonable, and without foundation in
    fact,’’ and (4) ‘‘the application of the fixed percentage
    factor by the assessor to increase the assessments on
    properties in Groton Long Point cannot reasonably be
    found to fulfill her statutory duty to determine the true
    and actual valuation of each individual property, in vio-
    lation of [General Statutes] § 12-64 . . . .’’
    Following certification of the class; see footnote 7 of
    this opinion; the case was tried to the court.16 After
    conducting a comprehensive review of the governing
    statutory and regulatory framework, and particularly
    the ratio testing standard set forth in § 12-62i-3 of the
    regulations17 for evaluating the performance of the
    revaluation process, the trial court concluded that the
    ‘‘1.35 adjustment factor applied to the [Groton Long
    Point] dwelling values did not violate § 12-119.’’ In so
    concluding, the trial court rejected the plaintiffs’ argu-
    ment that the defendants had disregarded a legal duty
    insofar as the ratio testing standards may be applied
    only on a townwide basis, rather than to specific neigh-
    borhoods on a preliminary basis. The trial court also
    rejected the plaintiffs’ reliance on Chamber of Com-
    merce of Greater Waterbury, Inc. v. Waterbury, 
    184 Conn. 333
    , 
    439 A.2d 1047
    (1981), for the ‘‘proposition
    that, in the revaluation context, the application of a
    fixed percentage without allowance for individual prop-
    erty differences is illegal pursuant to § 12-119’’; the court
    distinguished that case factually with respect to the
    extensive, individualized data collection that took place
    in the present case. To this end, the trial court con-
    cluded that Tyler was not required to ‘‘physically
    [re]inspect the [Groton Long Point] residential proper-
    ties’’ after it discovered that the initial ‘‘application of
    the original 1.2 adjustment factor yielded a median ASR
    of 88.31 percent . . . .’’18 Having credited the testimony
    of Gardner and Christy to the effect that the 1.35 adjust-
    ment factor ‘‘was used for the express purpose of
    increasing the [Groton Long Point] appraised values so
    that they would be closer to fair market value, instead
    of well below fair market value,’’ the trial court rejected
    the plaintiffs’ claim that ‘‘their assessments were mani-
    festly excessive’’ and the ‘‘illegal’’ result of ‘‘disregard
    of the relevant statutes . . . .’’ Accordingly, the trial
    court rendered judgment for the defendants. This
    appeal followed.
    On appeal, the plaintiffs claim that the trial court
    incorrectly concluded that the defendants’ assessment
    of Groton Long Point in the 2011 revaluation was not
    illegal. The plaintiffs renew their reliance on Chamber
    of Commerce of Greater Waterbury, Inc., and contend
    that the defendants’ use of an undifferentiated adjust-
    ment factor of 1.35 disregarded the ‘‘individualized
    process’’ required by § 12-62, insofar as ‘‘[t]here is no
    provision in our state statutes or the pertinent regula-
    tions that allows an assessor to apply a flat percentage
    to a group of properties simultaneously in order to
    ‘adjust’ their true and actual value.’’ The plaintiffs fur-
    ther argue that the defendants’ use of the adjustment
    factor was not authorized by § 12-62i-3 of the regula-
    tions, which contemplates the use of ratio testing for
    property classes, namely, residential, commercial, and
    vacant land, rather than ‘‘on much smaller groups, i.e.,
    residential neighborhoods,’’ and only to verify results,
    not ‘‘to actually set the assessed values themselves.’’
    The plaintiffs contend that any discrepancy resulting
    from the initial mass appraisal should have been
    addressed by ‘‘physically revisit[ing] those properties
    [to] verify the data collection and the information it
    produced,’’ rather than arbitrarily ‘‘running calculations
    until the numbers (subjectively) seem to more closely
    approximate some ideal of fair market value in the
    assessor’s mind . . . .’’19 Finally, the plaintiffs rely on
    Hartford/Windsor Healthcare Properties, LLC v. Hart-
    ford, 
    298 Conn. 191
    , 
    3 A.3d 56
    (2010), and argue that
    the trial court improperly found that they had ‘‘failed
    to demonstrate that the 2011 [revaluation] resulted in
    assessments that are manifestly excessive,’’ because
    that determination is ‘‘part and parcel of the stipulation
    that the defendants uniformly inflated the assessed
    value of the subject properties by 35 percent even
    though such an adjustment was not required in order
    to comply with the statutory standards.’’
    In response, the defendants contend that they prop-
    erly utilized the 1.35 adjustment factor to compensate
    for patterns of undervaluation of Groton Long Point
    properties relative to other neighborhoods in the town.
    The defendants argue that this methodology was consis-
    tent with the OPM regulations and the standards of
    the international association, and emphasize that OPM
    itself ultimately certified the results of the appraisal.
    Thus, the defendants also rely on Redding Life Care,
    LLC v. Redding, 
    308 Conn. 87
    , 
    61 A.3d 461
    (2013), and
    contend that the plaintiffs have failed to prove a viola-
    tion of § 12-119 because their complaint of ‘‘inadequate
    substantiation to support application of the 1.35 adjust-
    ment factor’’ pertains to insufficiency of data and a
    challenge to the appraisal methodology, rather than
    demonstrating illegality. The defendants further argue
    that Chamber of Commerce of Greater Waterbury, Inc.
    v. 
    Waterbury, supra
    , 
    184 Conn. 333
    , is distinguishable
    from the present case because, in addition to engaging
    in a comprehensive preappraisal field data gathering as
    to every property in town, Tyler reanalyzed that field
    data subsequent to the adjustment to verify the consis-
    tency of the mass appraisal results with actual property
    values as determined by sales. Finally, the defendants
    contend that the plaintiffs failed to prove that the valua-
    tion of their properties was manifestly excessive
    because they did not present any credible evidence
    of the values of their properties. We agree with the
    defendants and conclude that their application of the
    1.35 adjustment factor to the Groton Long Point residen-
    tial properties during the 2011 revaluation was not
    illegal.
    ‘‘In a tax appeal taken pursuant to § 12-119, the plain-
    tiff must prove that the assessment was (a) manifestly
    excessive and (b) . . . could not have been arrived at
    except by disregarding the provisions of the statutes
    for determining the valuation of the property. . . .
    [The plaintiff] must [set forth] allegations beyond the
    mere claim that the assessor overvalued the property.
    [The] plaintiff . . . must satisfy the trier that [a] far
    more exacting test has been met: either there was mis-
    feasance or nonfeasance by the taxing authorities, or
    the assessment was arbitrary or so excessive or discrim-
    inatory as in itself to show a disregard of duty on their
    part. . . . Only if the plaintiff is able to meet this exact-
    ing test by establishing that the action of the assessors
    would result in illegality can the plaintiff prevail in an
    action under § 12-119. The focus of § 12-119 is whether
    the assessment is illegal. . . . The statute applies only
    to an assessment that establishes a disregard of duty
    by the assessors. . . .
    ‘‘While an insufficiency of data or the selection of an
    inappropriate method of appraisal could serve as the
    basis for not crediting the appraisal report that resulted,
    it could not, absent evidence of misfeasance or malfea-
    sance, serve as the basis for an application for relief
    from a wrongful assessment under § 12-119. . . . In
    short, when reviewing a claim raised under § 12-119, a
    court must determine whether the plaintiff has proven
    that the assessment was the result of illegal conduct.’’20
    (Emphasis in original; internal quotation marks omit-
    ted.) Walgreen Eastern Co. v. West Hartford, 
    329 Conn. 484
    , 513–14, 
    187 A.3d 388
    (2018). Put differently, tax
    relief under § 12-119 is available only in an ‘‘extraordi-
    nary situation.’’ Second Stone Ridge Cooperative Corp.
    v. Bridgeport, 
    220 Conn. 335
    , 343, 
    597 A.2d 326
    (1991).
    Whether an assessment methodology violates the
    governing statutes and regulations for purposes of § 12-
    119 presents a question of law over which our review
    is plenary. See, e.g., Griswold Airport, Inc. v. Madison,
    
    289 Conn. 723
    , 739, 
    961 A.2d 338
    (2008); see also Red-
    ding Life Care, LLC v. 
    Redding, supra
    , 
    308 Conn. 101
    (‘‘[w]hen a tax appeal . . . raises a claim that chal-
    lenges the propriety of a particular appraisal method
    in light of a generally applicable rule of law, our review
    of the trial court’s determination whether to apply the
    rule is plenary’’ [internal quotation marks omitted]);
    Griswold Airport, Inc. v. 
    Madison, supra
    , 741–42
    (applying plenary review to claim that assessor violated
    General Statutes § 12-504h by terminating property’s
    open space classification and assessing it as condomin-
    ium units).
    Our review of the legality of the assessment begins
    with the OPM regulations, which were promulgated
    pursuant to § 12-62 (g); see footnote 17 of this opinion;
    for the purpose of guiding the revaluation process under
    § 12-62 (b) (2), which contemplates both a ‘‘field
    review’’ of the properties and the use of ‘‘generally
    accepted mass appraisal methods which may include,
    but need not be limited to, the market sales comparison
    approach to value, the cost approach to value and the
    income approach to value.’’ Beyond the regulations, we
    also consider the extent to which the appraisal com-
    plied with the Uniform Standards of Professional
    Appraisal Practice, as promulgated by the Appraisal
    Standards Board of the Appraisal Foundation, which
    ‘‘[r]eal estate appraisers in Connecticut are required to
    follow’’ pursuant to General Statutes § 20-504. Redding
    Life Care, LLC v. 
    Redding, supra
    , 
    308 Conn. 107
    n.18.
    Section 12-62 (g) (2) mandates the promulgation of
    regulations ‘‘establishing criteria for measuring the level
    and uniformity of assessments generated from a revalu-
    ation,’’ and provides that ‘‘such criteria shall be applica-
    ble to different classes of real property with respect to
    which a sufficient number of property sales exist.’’ The
    regulations promulgated by OPM in response to that
    mandate, in turn, provide that ‘‘[p]erformance-based
    revaluation standards shall consist of two acceptable
    methods as set forth in section[s] 12-62i-3 and 12-62i-4
    of the [r]egulations . . . .’’ Regs., Conn. State Agencies
    § 12-62i-2. Ratio testing, one of the two acceptable meth-
    ods, is governed by § 12-62i-3 of the regulations. That
    regulation requires an assessor conducting ratio testing
    to establish ‘‘[a] file of all real property sales transac-
    tions for the sales time period used’’; 
    Id., § 12-62i-3
    (a)
    (1); and also provides that, ‘‘[p]rior to finalizing a revalu-
    ation, the assessor shall conduct the following tests
    regarding the assessments derived from such revalua-
    tion. The assessments resulting from the revaluation
    shall be deemed sufficient, provided the following crite-
    ria are met:
    ‘‘(1) the overall level of assessment for all property
    classes shall be within plus or minus ten percent of the
    required seventy percent assessment ratio, as measured
    by the overall median ratio, and
    ‘‘(2) the level of assessment for each property class
    with fifteen or more market sales shall be within plus
    or minus five percent of the median overall level of
    assessment for each property class, and
    ‘‘(3) the coefficient of dispersion for each property
    class with fifteen or more market sales shall be equal
    to or less than fifteen percent for all property, equal to
    or less than fifteen percent for residential property,
    equal to or less than twenty percent for commercial
    property, and equal to or less than twenty percent for
    vacant land, and
    ‘‘(4) the price related differential for all properties
    and for each property class for which there are fifteen
    or more market sales shall be within 0.98 and 1.03, and
    ‘‘(5) the unsold property test result shall be between
    0.95 and 1.05.’’ 
    Id., § 12-62i-3
    (b).
    The ratio testing regulation further provides that, if
    its criteria ‘‘are not met, the assessor shall, prior to the
    implementation of the revaluation, further analyze and
    refine the data elements or methods used in the reval-
    uation. The assessor shall revalue the parcels of real
    property for which a deficiency in either the level of
    assessment or the uniformity of assessments has been
    identified.’’ 
    Id., § 12-62i-3
    (c).
    The plaintiffs correctly read the ratio testing regula-
    tion as mandating such evaluation following the com-
    pletion of the appraisal by general ‘‘ ‘[p]roperty class,’ ’’
    which is defined as ‘‘any one of the following three
    major classifications of real property: (A) residential;
    (B) commercial including apartments, industrial and
    public utility; and (C) vacant land . . . .’’ 
    Id., § 12-62i-
    1 (15). There are, however, two problems with the plain-
    tiffs’ interpretation of the ratio testing regulation. First,
    that regulation does not expressly preclude the use of
    ratio testing or adjustment factors during the mass
    appraisal process by ‘‘ ‘[n]eighborhood,’ ’’ which is
    defined as ‘‘a geographic area of complementary real
    property parcels that share similar locational and mar-
    ket value characteristics, and may be defined by natural,
    man-made, or political boundaries . . . .’’ 
    Id., § 12-62i-
    1 (13). Reading the ratio testing regulation in the manner
    urged by the plaintiffs would require us to add nonexis-
    tent language to its text, which is not how we read
    regulations. See, e.g., Williams v. General Nutrition
    Centers, Inc., 
    326 Conn. 651
    , 657, 
    166 A.3d 625
    (2017)
    (‘‘because regulations have the same force and effect
    as statutes, we interpret both using the plain meaning
    rule’’); Mayer v. Historic District Commission, 
    325 Conn. 765
    , 776, 
    160 A.3d 333
    (2017) (‘‘it is well settled
    that [w]e are not permitted to supply statutory language
    that the legislature may have chosen to omit’’ [internal
    quotation marks omitted]).
    Second, the plaintiffs’ reading of § 12-62i-3 of the
    regulations is inconsistent with the other regulatory
    text, which defines ‘‘ ‘[r]evaluation’ ’’ as ‘‘the mass
    appraisal of property to determine the true and actual
    value of all real property in a town for assessment
    purposes in accordance with section 12-62 . . . .’’
    Regs., Conn. State Agencies § 12-62i-1 (19). The very
    meaning of ‘‘ ‘[m]ass appraisal’ ’’ contemplates some
    estimation, insofar as it is defined as ‘‘the process of
    valuing a universe of properties as of a given date using
    standard methodology, employing common data, and
    allowing for statistical testing. Methodology that is
    acceptable shall include, but is not limited to, auto-
    mated valuation models, adaptive estimation proce-
    dure, multiple regression analysis, statistical analysis
    and other generally accepted techniques . . . .’’ 
    Id., § 12-62i-
    1 (10). Indeed, § 12-62f-4 of the regulations,
    which governs the valuation module to be used for
    computer assisted mass appraisal, specifically antici-
    pates such testing on a neighborhood basis, as such a
    valuation module must have ‘‘the capacity to calculate,
    print reports and output to standard analytical software
    programs the following measurements and sales/assess-
    ment ratios by property type and neighborhood: Sales
    prices; assessments; the mean sales/assessment ratio;
    the median sales/assessment ratio; the coefficient of
    dispersion; the standard deviation; the coefficient of
    variation; and the price-related differential.’’ (Emphasis
    added.) 
    Id., § 12-62f-4
    (d). Thus, to read § 12-62i-3 of
    the regulations in a manner absolutely precluding ratio
    testing on a more granular level than property class
    during the mass appraisal process would make little
    sense, as that regulation simply furnishes a broad mea-
    sure of quality control to be implemented ‘‘[p]rior to
    finalizing a revaluation . . . .’’ 
    Id., § 12-62i-3
    (b).
    Beyond the lack of regulatory or statutory preclusion,
    the Uniform Standards of Professional Appraisal Prac-
    tice support the defendants’ use of a ratio study during
    the mass appraisal process at issue in the present case.21
    Specifically, rule 6-7 of the Uniform Standards of Profes-
    sional Appraisal Practice provides that ‘‘[i]n reconciling
    a mass appraisal an appraiser must: (a) reconcile the
    quality and quantity of data available and analyzed
    within the approaches used and the applicability and
    relevance of the approaches, methods and techniques
    used; and (b) employ recognized mass appraisal testing
    procedures and techniques to ensure that standards of
    accuracy are maintained.’’ Appraisal Standards Board,
    Appraisal Foundation, 2010-11 Uniform Standards of
    Professional Appraisal Practice (2010) p. U-51. The
    commentary to that rule observes that ‘‘[i]t is implicit
    in mass appraisal that, even when properly specified
    and calibrated mass appraisal models are used, some
    individual value conclusions will not meet standards of
    reasonableness, consistency, and accuracy. However,
    appraisers engaged in mass appraisal have a profes-
    sional responsibility to ensure that, on an overall basis,
    models produce value conclusions that meet attainable
    standards of accuracy. This responsibility requires
    appraisers to evaluate the performance of models,
    using techniques that may include but are not limited
    to, goodness-of-fit statistics, and model performance
    statistics such as appraisal-to-sale ratio studies, eval-
    uation of hold-out samples, or analysis of residuals.’’
    (Emphasis added.) Id.; see also 
    id., p. U-53
    (noting that
    written report of mass appraisal must ‘‘describe calibra-
    tion methods considered and chosen,’’ ‘‘identify the
    appraisal performance tests used and set forth the per-
    formance measures attained,’’ and ‘‘describe the recon-
    ciliation performed [under rule] 6-7’’).
    Consistent with the Uniform Standards of Profes-
    sional Appraisal Practice, the use of ratio studies and
    ‘‘direct equalization’’ via the application of adjustment
    factors are an established component of mass appraisal
    practice, and are specifically embraced by the interna-
    tional association. See generally International Associa-
    tion of Assessing Officers, Standard on Ratio Studies
    (2013); International Association of Assessing Officers,
    Fundamentals of Mass Appraisal (2011).22 The ‘‘assess-
    ment standards set forth’’ in the international associa-
    tion’s standards ‘‘represent a consensus in the assessing
    profession,’’ and the international association’s execu-
    tive board adopted them in order to ‘‘provide a sys-
    tematic means by which concerned assessing officers
    can improve and standardize the operation of their
    offices.’’ Standard on Ratio Studies, supra, p. 1. Those
    standards have been considered authoritative in this
    area by sister state high courts. See Douglas v. Nebraska
    Tax Equalization & Review Commission, 
    296 Neb. 501
    , 508, 
    894 N.W.2d 308
    (2017) (‘‘[g]enerally accepted
    mass appraisal techniques include the standards prom-
    ulgated by the [international association]’’); Clifton v.
    Allegheny, 
    600 Pa. 662
    , 694, 
    969 A.2d 1197
    (2009) (noting
    that international association standards ‘‘are widely
    accepted as the best criteria for judging the adequacy
    of a property assessment’’); see also Thorsness v. Porter
    County Assessor, 
    3 N.E.3d 49
    , 53 (Ind. Tax 2014) (not-
    ing that state ‘‘administrative agency charged with
    ensuring that . . . property assessments are uniform
    and equal—has provided guidance about how to com-
    pile and evaluate the data necessary for an assessment
    ratio study’’ by adopting international association’s
    standards ‘‘through its duly promulgated administrative
    regulations’’ [footnote omitted]). A separate publication
    by the international association, entitled Fundamentals
    of Mass Appraisal, complements their standards and
    serves as a more general ‘‘textbook [that] is intended
    to provide a basic understanding and overview of the
    many factors that shape mass appraisal theory and prac-
    tice.’’ Fundamentals of Mass Appraisal, supra, p. v.
    Beyond their use in quality control by oversight agen-
    cies such as OPM, the international association’s stan-
    dards suggest specifically that ratio studies may be
    utilized internally to ‘‘help improve appraisal methods
    or identify areas within the jurisdiction that need atten-
    tion.’’ Standard on Ratio Studies, supra, p. 7. Ratio stud-
    ies may be used to consider the accuracy of a mass
    appraisal, including with respect to ‘‘[u]niformity’’ or
    ‘‘the degree to which properties are appraised at equal
    percentages of market value.’’23 Id.; see also 
    id., p. 8
    (‘‘Local jurisdictions should use ratio studies as a pri-
    mary mass appraisal testing procedure and their most
    important performance analysis tool. The ratio study
    can assist such jurisdictions in providing fair and equita-
    ble assessment of all property.’’). The ‘‘ratio study is a
    form of applied statistics, because the analyst draws
    conclusions about the appraisal of the population (the
    entire jurisdiction) of properties based only on those
    that have sold during a given time period. The sales
    ratios constitute the sample that will be used to draw
    conclusions or inferences about the population.’’ 
    Id., p. 8.
       With respect to data collection and analysis, the inter-
    national association’s standards contemplate ‘‘[s]tratifi-
    cation [to divide] all the properties within the scope of
    the study into two or more groups or strata,’’ which
    ‘‘facilitates a more complete and detailed picture of
    appraisal performance and can enhance sample repre-
    sentativeness.’’ 
    Id., p. 9.
    In observing that stratification
    can ‘‘help identify differences in level of appraisal
    between property groups,’’ those standards specifically
    suggest that ‘‘neighborhood’’ is an appropriate stratum,
    in addition to ‘‘[e]ach type of property subject to a
    distinct level of assessment,’’ with ‘‘stratification by geo-
    graphic areas . . . generally more appropriate for resi-
    dential properties . . . .’’ 
    Id. Once appropriate
    sales
    are identified during the collection of market data, the
    statistical analysis takes place, as those sales are
    ‘‘matched against assessed values, ratios computed, and
    outliers identified and removed if appropriate, mea-
    sures of appraisal level, uniformity, and reliability for
    the entire jurisdiction and each group or stratum should
    be computed.’’ 
    Id. The international
    association allows for a 10 percent
    ‘‘window . . . about the market value standard [as] a
    reasonable range in which measures of central tendency
    should fall in ad valorem mass appraisal.’’ Fundamen-
    tals of Mass Appraisal, supra, p. 243. This ‘‘standard
    provides a reasonable, constructive, and cost-effective
    basis for ensuring that appraisals approximate market
    values.’’ 
    Id. With respect
    to uniformity among the vari-
    ous strata, ‘‘[e]ach major stratum should be appraised
    within 5 percent of the overall level of appraisal for the
    jurisdiction. Thus, if the overall level is 0.900, each
    property class and area should be appraised between
    0.855 and 0.945 . . . .’’ Id.; see also Standard on Ratio
    Studies, supra, pp. 18–19.
    Most significantly, the international association’s
    standards contemplate the ‘‘common’’ use of ‘‘[e]qual-
    ization . . . to address problems associated with
    appraisal level,’’ while also observing that ‘‘[r]eappraisal
    orders can be used to correct uniformity problems.’’
    Standard on Ratio Studies, supra, p. 21. ‘‘Equalization,’’
    in general, is the ‘‘process by which an appropriate
    governmental body attempts to ensure that property
    under its jurisdiction is assessed at the same assessment
    ratio or at the ratio or ratios required by law. Equaliza-
    tion can be undertaken at many different levels. Equal-
    ization among use classes (such as agricultural and
    industrial property) can be undertaken at the local level
    . . . .’’ 
    Id., p. 40.
    ‘‘Direct equalization’’24 is the ‘‘process
    of converting ratio study results into adjustment factors
    (trends) and changing locally determined appraised or
    assessed values to more nearly reflect market value or
    the legally required level of assessment.’’25 
    Id. Although the
    international association’s standards
    caution that ‘‘[e]qualization is not an appraisal or a
    substitute for reappraisal,’’ they nevertheless counsel
    that the advantage of direct equalization is that it ‘‘can
    be applied to specified strata, such as property classes,
    geographic areas, and political subdivisions that fail
    to meet appraisal level performance standards . . . .
    Direct equalization also produces results that are gener-
    ally more visible to the taxpayer and more clearly
    reduces perceived inequities between classes . . . .’’
    (Citations omitted; emphasis added.) 
    Id., p. 21;
    see also
    
    id., p. 23
    (‘‘[o]ther property groups, such as market
    areas, school districts and tax units, could constitute
    additional strata’’). Indeed, when ‘‘applied at the stra-
    tum level [direct equalization] improves equality in
    effective tax rates between strata and lessens the effect
    of assessment practices that improperly favor one stra-
    tum over another.’’26 
    Id., p. 22.
    Those standards note that
    ‘‘[s]tratification can help identify differences in level of
    appraisal between property groups. In large jurisdic-
    tions, stratification by market areas is generally more
    appropriate for residential properties, while stratifica-
    tion of commercial properties by either geographic area
    or property subtypes (e.g., office, retail, and warehouse/
    industrial) can be more effective.’’ 
    Id., p. 24.
    Such
    ‘‘[s]tratification facilitates a more complete and detailed
    picture of appraisal performance and can enhance sam-
    ple representativeness.’’ 
    Id., p. 23.
       ‘‘If noncompliance with either direct or indirect equal-
    ization standards is indicated, the appropriate point
    estimate (statistic) measuring appraisal level should be
    used to calculate adjustment factors, by dividing it into
    100 percent.’’ 
    Id., p. 35.
    Accordingly, we conclude that
    the record demonstrates that the use of ratio studies
    and direct equalization via adjustment factors as applied
    to a neighborhood stratum is a valid component of mass
    appraisal practice under the standards adopted by the
    international association.
    Having determined that the defendants validly incor-
    porated ratio studies and direct equalization via adjust-
    ment factors to neighborhood strata into the 2011
    revaluation, we further conclude that the trial court
    properly rejected the plaintiffs’ challenge to their use
    in this specific case. The trial court credited Gardner’s
    testimony that the application of the 1.35 percent adjust-
    ment factor to the dwellings in Groton Long Point was
    necessary to bring the median ASR for that neighbor-
    hood in line with the other neighborhoods in the town,
    and to keep the properties in Groton Long Point from
    being undervalued—and therefore undertaxed—rela-
    tive to the rest of the town. Gardner testified that strati-
    fication by neighborhood was necessary because
    Groton has thirteen neighborhoods, each ‘‘unique to
    itself,’’ with five on the water and others with ‘‘interior
    cookie cutter homes.’’ Although the amenities available
    to Groton Long Point residents, such as the private
    beaches and dock, run with the land, Gardner elected
    to adjust the building values as a component of the
    total value, rather than the land values, because she
    had high confidence in the underlying land values based
    on a comparison to three valid vacant lot sales. ‘‘[T]his
    court has held that [t]he process of estimating the value
    of property for taxation is, at best, one of approximation
    and judgment, and there is a margin for a difference of
    opinion. . . . There may be more ways than one for
    estimating the value of such . . . [property] for taxa-
    tion. . . . Many factors may enter into the determina-
    tion of the value of a piece of property. Its value is, in the
    final analysis, a matter of opinion.’’ (Citation omitted;
    internal quotation marks omitted.) Redding Life Care,
    LLC v. 
    Redding, supra
    , 
    308 Conn. 110
    .
    This court’s decision in Chamber of Commerce of
    Greater Waterbury, Inc. v. 
    Waterbury, supra
    , 
    184 Conn. 333
    , on which the plaintiffs rely heavily, is distinguish-
    able and does not invalidate the town’s 2011 revaluation
    as a matter of law. In that case, we considered a chal-
    lenge to Waterbury’s revised grand list for October 1,
    1979, which ‘‘consisted of adjustments made in the
    assessments of about 300 commercial and industrial
    properties, which [the assessor] and his staff inspected
    and analyzed individually, and a 28 percent increase
    ‘across the board’ in the assessments of the remaining
    commercial and industrial properties in Waterbury,
    approximately 2500 in number.’’ 
    Id., 334–35. This
    court
    affirmed the judgment of the trial court enjoining the
    fixed 28 percent increase, determining that the ‘‘applica-
    tion of a fixed percentage factor to increase assess-
    ments without making any allowance for individual
    differences in properties has been widely condemned.
    . . . The basic deficiency of such a valuation procedure
    is the failure to consider all of the elements which may
    reasonably affect the value of the property.’’ (Citations
    omitted.) 
    Id., 336–37. In
    concluding that the fixed 28 percent increase with-
    out consideration of the properties’ individual charac-
    teristics was illegal, this court observed that, under
    §§ 12-64 (a) and 12-62 (a), ‘‘[t]axable property is subject
    to taxation at a uniform percentage of ‘its present true
    and actual valuation.’ . . . In establishing assessments
    the assessors are required to ‘view all of the real estate
    of their respective municipalities.’ . . . These statutes
    contemplate assessments based upon a considera-
    tion of the individual characteristics of each property
    listed.’’ (Citations omitted.) 
    Id., 337. The
    court con-
    cluded that the ‘‘28 percent increase in the valuations
    of the 2500 commercial and industrial properties which
    [the assessor] did not examine individually was a pro-
    jection from the conclusion he reached from his analy-
    sis of 300 such properties upon an individual basis.
    His conclusion of a minimum 28 percent underval-
    uation of those properties could not fairly be applied
    to all other business properties in Waterbury without
    some showing that the undervaluation had occurred
    for reasons affecting all business properties alike. We
    cannot assume that the 300 properties studied by the
    assessor are sufficiently similar in character or loca-
    tion to allow a reasonable inference that the remaining
    2500 properties have been uniformly undervalued by
    28 percent.’’27 (Emphasis added.) 
    Id., 337. Accordingly,
    the court concluded ‘‘that the application of the fixed
    percentage factor by the assessor to increase the assess-
    ments on the properties of the plaintiffs cannot reason-
    ably be found to fulfill his statutory duty to determine
    the ‘true and actual valuation’ of each individual prop-
    erty.’’28 
    Id., 338. Chamber
    of Commerce of Greater Waterbury, Inc.,
    is readily distinguishable from the present case. First,
    the record in the present case reveals that Gardner and
    the assessment team from Tyler made an individual
    assessment of every property in the town—including
    field visits, requests for inspections, and communica-
    tions with each homeowner prior to the finalization of
    the assessment in accordance with § 12-62 (b) and § 12-
    62i-3 of the regulations. The trial court reasonably cred-
    ited the testimony of Gardner and Christy that addi-
    tional visits were not necessary prior to the application
    of the adjustment because they had gained all relevant
    information about the properties. See footnote 14 of
    this opinion and accompanying text. Second, in contrast
    to Chamber of Commerce of Greater Waterbury, Inc.,
    the adjustment in this case was not applied townwide,
    but rather, only to a narrow strata of properties in a
    unique neighborhood in connection with a computer
    assisted mass appraisal that was conducted in accor-
    dance with both the OPM regulations and widely
    accepted appraisal standards. Accordingly, we con-
    clude that Chamber of Commerce of Greater Water-
    bury, Inc., does not render the assessment in the
    present case illegal.29
    The plaintiffs contend, however, that the application
    of the 1.35 adjustment factor was invalid because it was
    arbitrarily chosen by Christy, ‘‘had no mathematical or
    technical connection to the initial assessments made
    by the CAMA program, and was not intended to remedy
    some specific defect.’’ They argue that it is ‘‘completely
    unrelated to the true and actual value of each home in
    Groton Long Point.’’ To this end, the plaintiffs rely on
    certain data presented through the testimony of Edward
    Bogdan, a member of the certified class in the present
    case; see footnote 7 of this opinion; in support of the
    proposition that Groton Long Point experienced a 25
    percent decrease in home sale prices between 2009 and
    2011. Specifically, the plaintiffs posit that this informa-
    tion undermines the sales set utilized by Christy in
    performing her assessments. This evidence is insuffi-
    cient, however, to establish illegality, insofar as ‘‘[w]hile
    an insufficiency of data or the selection of an inappro-
    priate method of appraisal could serve as the basis for
    not crediting the appraisal report that resulted, it could
    not, absent evidence of misfeasance or malfeasance,
    serve as the basis for an application for relief from
    a wrongful assessment under § 12-119.’’ Second Stone
    Ridge Cooperative Corp. v. 
    Bridgeport, supra
    , 
    220 Conn. 343
    ; see also Redding Life Care, LLC v. 
    Redding, supra
    , 
    308 Conn. 111
    (‘‘although the plaintiff may dis-
    agree that the hypothetical condition was necessary to
    reach the valuation, it has failed to demonstrate that
    the town assessor’s reliance on the condition was ille-
    gal, and, accordingly, the plaintiff cannot prevail on its
    claim under § 12-119’’ [emphasis in original]). Moreover,
    the plaintiffs have failed to introduce evidence to prove
    that the adjustment to the appraised value—even by 35
    percent—actually resulted in a manifest overvaluation
    of their properties relative to true and actual fair market
    value.30 See Walgreen Eastern Co. v. West 
    Hartford, supra
    , 
    329 Conn. 513
    (‘‘[m]ere overvaluation, without
    more, in an assessment of property is not enough to
    make out a case under § 12-119’’ [internal quotation
    marks omitted]); see also 
    id., 513–14 ($120,000
    valuation
    error on approximately $5 million property, which was
    2.4 percent, was not manifestly excessive for purposes
    of relief under § 12-119); cf. Griswold Airport, Inc. v.
    
    Madison, supra
    , 
    289 Conn. 741
    –42 (because improper
    removal of airport’s open space classification in viola-
    tion of § 12-504h ‘‘caused its assessed value to grow
    more than eightfold,’’ this court concluded that ‘‘the
    trial court’s determination . . . necessarily incorpo-
    rated an implicit finding that the resultant assessment
    was manifestly excessive’’). Accordingly, ‘‘we conclude
    that the circumstances presented here do not rise to
    the level of the extraordinary situation that would war-
    rant tax relief under the provisions of § 12-119.’’ (Inter-
    nal quotation marks omitted.) Walgreen Eastern Co. v.
    West 
    Hartford, supra
    , 514.
    The judgment is affirmed.
    In this opinion the other justices concurred.
    * This case originally was scheduled to be argued before a panel of this
    court consisting of Chief Justice Robinson and Justices Palmer, McDonald,
    D’Auria, Mullins, Kahn and Ecker. Although Chief Justice Robinson was not
    present when the case was argued before the court, he has read the briefs
    and appendices, and listened to a recording of the oral argument prior to
    participating in this decision.
    1
    General Statutes § 12-62 (b) provides: ‘‘(1) Commencing October 1, 2006,
    each town shall implement a revaluation not later than the first day of
    October that follows, by five years, the October first assessment date on
    which the town’s previous revaluation became effective, provided, a town
    that opted to defer a revaluation, pursuant to section 12-62l, shall implement
    a revaluation not later than the first day of October that follows, by five years,
    the October first assessment date on which the town’s deferred revaluation
    became effective. The town shall use assessments derived from each such
    revaluation for the purpose of levying property taxes for the assessment
    year in which such revaluation is effective and for each assessment year
    that follows until the ensuing revaluation becomes effective.
    ‘‘(2) When conducting a revaluation, an assessor shall use generally
    accepted mass appraisal methods which may include, but need not be limited
    to, the market sales comparison approach to value, the cost approach to
    value and the income approach to value. Prior to the completion of each
    revaluation, the assessor shall conduct a field review. Except in a town that
    has a single assessor, the members of the board of assessors shall approve,
    by majority vote, all valuations established for a revaluation.
    ‘‘(3) An assessor, member of an assessor’s staff or person designated by
    an assessor may, at any time, fully inspect any parcel of improved real
    property in order to ascertain or verify the accuracy of data listed on the
    assessor’s property record for such parcel. Except as provided in subdivision
    (4) of this subsection, the assessor shall fully inspect each such parcel once
    in every ten assessment years, provided, if the full inspection of any such
    parcel occurred in an assessment year preceding that commencing October
    1, 1996, the assessor shall fully inspect such parcel not later than the first
    day of October of 2009, and shall thereafter fully inspect such parcel in
    accordance with this section. Nothing in this subsection shall require the
    assessor to fully inspect all of a town’s improved real property parcels in
    the same assessment year and in no case shall an assessor be required to fully
    inspect any such parcel more than once during every ten assessment years.
    ‘‘(4) An assessor may, at any time during the period in which a full
    inspection of each improved parcel of real property is required, send a
    questionnaire to the owner of such parcel to (A) obtain information concern-
    ing the property’s acquisition, and (B) obtain verification of the accuracy
    of data listed on the assessor’s property record for such parcel. An assessor
    shall develop and institute a quality assurance program with respect to
    responses received to such questionnaires. If satisfied with the results of
    said program concerning such questionnaires, the assessor may fully inspect
    only those parcels of improved real property for which satisfactory verifica-
    tion of data listed on the assessor’s property record has not been obtained
    and is otherwise unavailable. The full inspection requirement in subdivision
    (3) of this subsection shall not apply to any parcel of improved real property
    for which the assessor obtains satisfactory verification of data listed on the
    assessor’s property record.’’
    2
    The other original plaintiffs in the present case are Mary B. Tuohy,
    Robert Feery, Yola Feery, David W. Nickolenko, Sr., Charlene J. Nickolenko,
    James J. Falcone, Linda A. Falcone, Louise H. Fisher, and Betsey F. Amador.
    See also footnote 7 of this opinion.
    3
    General Statutes § 12-119 provides: ‘‘When it is claimed that a tax has
    been laid on property not taxable in the town or city in whose tax list
    such property was set, or that a tax laid on property was computed on an
    assessment which, under all the circumstances, was manifestly excessive
    and could not have been arrived at except by disregarding the provisions
    of the statutes for determining the valuation of such property, the owner
    thereof or any lessee thereof whose lease has been recorded as provided
    in section 47-19 and who is bound under the terms of his lease to pay real
    property taxes, prior to the payment of such tax, may, in addition to the
    other remedies provided by law, make application for relief to the superior
    court for the judicial district in which such town or city is situated. Such
    application may be made within one year from the date as of which the
    property was last evaluated for purposes of taxation and shall be served
    and returned in the same manner as is required in the case of a summons
    in a civil action, and the pendency of such application shall not suspend
    action upon the tax against the applicant. In all such actions, the Superior
    Court shall have power to grant such relief upon such terms and in such
    manner and form as to justice and equity appertains, and costs may be
    taxed at the discretion of the court. If such assessment is reduced by said
    court, the applicant shall be reimbursed by the town or city for any overpay-
    ment of taxes in accordance with the judgment of said court.’’
    4
    The plaintiffs appealed from the judgment of the trial court to the Appel-
    late Court, and we transferred the appeal to this court pursuant to General
    Statutes § 51-199 (c) and Practice Book § 65-1.
    5
    Unless otherwise noted, all references herein to the trial court are to
    Judge Moll.
    6
    ‘‘The town is divided into thirteen residential neighborhoods. The term
    ‘neighborhood’ is defined in the revaluation regulations as ‘a geographic
    area of complementary real property parcels that share similar locational
    and market value characteristics, and may be defined by natural, man-made,
    or political boundaries . . . .’ Regs., Conn. State Agencies § 12-62i-1 (13).’’
    7
    The trial court, Cohn, J., granted the plaintiffs’ motion for class certifica-
    tion to make them representatives of a class that includes ‘‘[a]ll owners of
    taxable residential real property with buildings thereon in . . . Groton Long
    Point . . . between October 1, 2011, and July 1, 2013, excluding those own-
    ers who individually appealed their real property tax assessments to the
    Superior Court and whose appeals have reached a final judgment.’’
    8
    ‘‘With respect to [Groton Long Point], the land values were established
    using three vacant lot sales.’’
    9
    ‘‘As part of this work, Tyler sent sales verification documents to the
    town to determine whether there were any unknown features within the
    validated sales set.’’
    10
    ‘‘Christy has conducted sales ratio studies by neighborhood, in addition
    to townwide, in every revaluation she has handled.’’
    11
    ‘‘An ASR results from the comparison between the assessed value that
    the CAMA program generates and the validated actual sale.’’
    12
    ‘‘Christy even testified that, in her view, to adopt the 1.2 adjustment
    factor would have been unethical.’’
    13
    ‘‘The [international association] is an international group that adopts
    standards that appraisers in revaluation use.’’
    14
    We note that the trial court’s memorandum of decision contains the
    following finding: ‘‘After changing the 1.2 factor to a 1.35 factor, Tyler did
    a ‘field review’ of all the values that resulted (meaning they went out and
    reviewed every property in [Groton Long Point] to ensure that the new
    computer generated values appeared to be full and fair market value for
    the whole sample).’’ (Emphasis added.) This finding is, however, inconsistent
    with the trial court’s subsequent observation that, ‘‘at the time Tyler [and
    the] the town conducted the preliminary ratio tests that revealed a median
    ASR of 88.31 percent for [Groton Long Point], they were satisfied with the
    data collection concerning the [Groton Long Point] properties that had
    occurred over the [eighteen] month period prior thereto and believed that
    there was no need to physically reinspect each [Groton Long Point] prop-
    erty.’’ (Emphasis added.) See footnote 18 of this opinion. We agree with the
    plaintiffs that the first finding on this point is clearly erroneous, in contrast
    to the second finding, which is supported by the record—namely, testimony
    from both Christy and Gardner indicating that no physical inspection of
    the subject properties was performed after Christy ran the various CAMA
    scenarios and changed the adjustment factor from 1.2 to 1.35.
    15
    ‘‘The parties stipulated that, had the town applied a 1.0 factor to [Groton
    Long Point], the resulting residential property class values would have
    passed the ratio testing standards set forth in the OPM regulations.’’
    16
    The trial court, Miller, J., previously had denied the parties’ motions
    for summary judgment, concluding that the ‘‘opinions of dueling appraisal
    experts’’ presented a genuine issue of material fact with respect to the
    manifest excessiveness of the assessments and whether the application of
    the 1.35 factor to all of the properties in Groton Long Point disregarded
    statutory requirements to ‘‘determine the true and actual valuation of each
    individual property . . . .’’
    17
    OPM promulgated this regulation pursuant to General Statutes § 12-62
    (g), which provides: ‘‘The secretary shall adopt regulations, in accordance
    with the provisions of chapter 54, which an assessor shall use when conduct-
    ing a revaluation. Such regulations shall include (1) provisions governing
    the management of the revaluation process, including, but not limited to,
    the method of compiling and maintaining property records, documenting
    the assessment year during which a full inspection of each parcel of improved
    real property occurs, and the method of determining real property sales
    data in support of the mass appraisal process, and (2) provisions establishing
    criteria for measuring the level and uniformity of assessments generated
    from a revaluation, provided such criteria shall be applicable to different
    classes of real property with respect to which a sufficient number of property
    sales exist. Certification of compliance with not less than one of said regula-
    tory provisions shall be required for each revaluation and the assessor shall,
    not later than the date on which the grand list reflecting assessments of
    real property derived from a revaluation is signed, certify to the secretary
    and the chief executive officer, in writing, that the revaluation was conducted
    in accordance with said regulatory requirement. Any town effecting a revalu-
    ation with respect to which an assessor is unable to certify such compliance
    shall be subject to the penalty provided in subsection (d) of this section.
    In the event the assessor designates a revaluation company to perform mass
    appraisal valuation or field review functions with respect to a revaluation,
    the assessor and the employee of said company responsible for such function
    or functions shall jointly sign such certification. The assessor shall retain
    a copy of such certification and any data in support thereof in the assessor’s
    office. The provisions of subsection (c) of this section concerning the public
    inspection of criteria, guidelines, price schedules or statement of procedures
    used in a revaluation shall be applicable to such certification and support-
    ing data.’’
    18
    The trial court emphasized that the plaintiffs and their expert witness
    had failed to cite any statute or regulation requiring such reinspection, and
    credited Christy’s testimony that the defendants were ‘‘satisfied with the
    data collection concerning the [Groton Long Point] properties that had
    occurred over the [eighteen] month period prior thereto and believed that
    there was no need to physically reinspect each [Groton Long Point] residen-
    tial property.’’
    19
    The plaintiffs also posit that, to the extent that adjustment was required
    because of Groton Long Point’s ‘‘unique’’ features and amenities, § 12-62
    required the defendants to conduct individual assessments, particularly
    because access to the amenities runs with the land, and the defendants
    adjusted the value of the improvements, rather than the land.
    20
    ‘‘In Second Stone Ridge Cooperative Corp. v. Bridgeport, 
    220 Conn. 335
    ,
    339, 
    597 A.2d 326
    (1991), we explained the distinction between municipal
    tax appeals brought pursuant to § 12-119 and those authorized by General
    Statutes § 12-117a, formerly codified at General Statutes § 12-118. While the
    latter statute provide[s] a method by which an owner of property may
    directly call in question the valuation placed by assessors upon his property
    by an appeal to the board of [tax relief], and from it to the courts . . . § 12-
    119 allows a taxpayer to claim either that a town lacked authority to tax
    the subject property, or that the assessment was manifestly excessive and
    could not have been arrived at except by disregarding the provisions of the
    statutes for determining the valuation of [the real] property . . . . In short,
    § 12-117a is concerned with overvaluation, while [t]he focus of § 12-119 is
    whether the assessment is illegal.’’ (Citations omitted; internal quotation
    marks omitted.) Griswold Airport, Inc. v. Madison, 
    289 Conn. 723
    , 740, 
    961 A.2d 338
    (2008).
    21
    The Uniform Standards of Professional Appraisal Practice was admitted
    into evidence at trial as plaintiffs’ exhibit 17. We also note that the relevant
    portions of this publication were reproduced in part II of the plaintiffs’
    appendix to their brief filed in this appeal.
    22
    The Fundamentals of Mass Appraisal and the Standard on Ratio Studies
    were admitted into evidence, respectively, as defendants’ exhibit 609 and
    plaintiffs’ exhibit 16. We note that certain relevant portions of these publica-
    tions were also reproduced in the appendices to the briefs submitted by
    the parties in this appeal.
    23
    The Fundamentals observe that ‘‘[r]atio studies measure two primary
    aspects of mass appraisal accuracy: level of valuation and uniformity of
    values. Appraisal level refers to the overall, or typical, ratio at which proper-
    ties are appraised relative to market value. In mass appraisal, appraised
    values should not be expected always to equal independent indicators of
    market value (sale prices or independent appraisals), but high and low ratios
    should balance, so that the typical ratio is near 100 percent.’’ (Emphasis
    in original.) Fundamentals of Mass Appraisal, supra, p. 198. In contrast,
    ‘‘[a]ppraisal uniformity relates to the extent to which appraisal procedures
    produce logical and consistent results across individual properties. Unifor-
    mity requires, first, that properties be appraised equitably within groups or
    categories (use classes, neighborhoods, and so forth); that is, how close
    are the individual ratios to the typical ratio (appraisal level)? Second, each
    group of properties should be appraised at approximately the same level
    or percentage of market value. In sum, appraisal uniformity requires equity
    within groups and between groups.’’ 
    Id. (Emphasis in
    original.)
    24
    ‘‘Direct equalization involves use of adjustment factors, which produce
    effects mathematically identical to those derived through the application of
    ‘trending’ or ‘index’ factors, which are commonly used for value updating
    by local assessing jurisdictions. The most significant differences typically
    are the level of the jurisdiction originating the adjustments and the stratifica-
    tion of property to which the factors are applied. Local jurisdictions with
    primary assessment responsibility can develop value adjustment factors as
    an interim step between complete reappraisals. Such factors commonly
    are applied to properties by property type, location, size, age and other
    characteristics . . . . It is rare for equalization factors developed by over-
    sight agencies to be applied to strata more specific than property class or
    broad geographic area. Often such factors are applied [jurisdiction wide].’’
    (Citation omitted.) Standard on Ratio Studies, supra, p. 21.
    25
    In contrast to direct equalization, ‘‘[w]hen indirect equalization is used,
    appraisals are not adjusted. Instead, indirect equalization involves an over-
    sight agency estimating total taxable value, given the legally required level
    of assessment or market value. Indirect equalization allows proper distribu-
    tion of intergovernmental transfer payments between state or provincial and
    local governments despite different levels of appraisal among jurisdictions
    or property classes.’’ Standard on Ratio Studies, supra, p. 21.
    26
    The international association’s standards provide, for example, that
    ‘‘assuming that all classes of property are to be assessed at 100 [percent]
    of market value, without such equalization, in a case [in which] residential
    property is assessed at a median of 80 [percent] of market value, while
    commercial property is assessed at a median of 90 [percent] of market
    value, residential property will pay 80 [percent] of its proper tax share and
    commercial property will pay 90 [percent] of its proper tax share. Other
    classes that may be assessed at 100 [percent] will pay more than their
    proper tax shares. Direct equalization mitigates this problem. However, such
    equalization cannot improve uniformity between properties within a given
    stratum. So, in the previous example, the median level of assessment for
    residential property can be adjusted from 80 [percent] to 100 [percent] of
    market value, assessment disparities between individual residential proper-
    ties will not be addressed. For this reason, reappraisal orders should be
    considered as the primary corrective tool for uniformity problems, and
    direct equalization should be considered appropriate only if time or other
    constraints preclude such an approach.’’ Standard on Ratio Studies, supra,
    p. 22.
    27
    The court also observed that the assessor’s study itself revealed a wide
    variety of undervaluation, from 28 to 45 percent, making it ‘‘clear that the
    application of the 28 percent factor would not reflect the value of a particular
    property based upon its individual characteristics as the statutes require.
    Even for properties falling within the normal range of undervaluation, there
    would be a substantial disproportion in the tax burden imposed on those
    at the lower part of the range, which presumably would carry their full
    share by application of the 28 percent factor, and those at the higher part
    of the range which would not.’’ Chamber of Commerce of Greater Waterbury,
    Inc. v. 
    Waterbury, supra
    , 
    184 Conn. 338
    .
    28
    We note that the court rejected Waterbury’s argument that ‘‘even after
    the application of the fixed percentage increase each of the affected proper-
    ties has been valued at a figure not exceeding its fair market value.’’ Chamber
    of Commerce of Greater Waterbury, Inc. v. 
    Waterbury, supra
    , 
    184 Conn. 336
    . The court stated that ‘‘valuation of property in excess of fair market
    value is not the only ground upon which a taxpayer may be entitled to relief.
    . . . Any circumstances indicating that a disproportionate share of the tax
    burden is being thrust upon a taxpayer would warrant judicial intervention.
    . . . The plaintiffs claim that an illegal method of establishing assessments
    for their properties has been followed, which has not been applied to other
    taxpayers. If the challenged procedure is illegal, the plaintiffs must prevail.’’
    (Citations omitted.) 
    Id. Chamber of
    Commerce of Greater Waterbury, Inc.,
    is not expressly a § 12-119 case, and does not even cite that statute. As
    such, this portion of the analysis in that case is inconsistent with the well
    established conjunctive test governing § 12-119, which requires proof of
    both an illegal assessment and that the valuation is manifestly excessive.
    See, e.g., Walgreen Eastern Co. v. West 
    Hartford, supra
    , 
    329 Conn. 513
    –14.
    29
    Accordingly, we also find distinguishable the Superior Court cases on
    which the plaintiffs rely, both of which were not mass appraisal cases
    conducted under the international association’s standards. See Rand-Whit-
    ney Containerboard L.P. v. Montville, Superior Court, judicial district of
    New London, Docket No. CV-XX-XXXXXXX-S (October 30, 2006) (application of
    lower depreciation rate solely to plaintiff’s property and no other taxpayers);
    Yankee Gas Co. v. Meriden, Superior Court, judicial district of Tolland,
    Complex Litigation Docket, Docket No. X07-CV-XX-XXXXXXX-S (April 20, 2001)
    (
    29 Conn. L. Rptr. 285
    , 291) (creation of unique methodology aimed solely at
    plaintiff’s property was equal protection violation actionable under § 12-119).
    30
    We emphasize that our analysis in this appeal is limited to the legality
    of the mass appraisal methodology and does not determine the validity of any
    individual property owners’ claims of overassessment pursuant to General
    Statutes § 12-117a as a result of the application of an adjustment factor
    during direct equalization. See footnote 20 of this opinion.