Aileen H Char Life Int v. Maricopa Co ( 2004 )


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  •                    SUPREME COURT OF ARIZONA
    En Banc
    AILEEN H. CHAR LIFE INTEREST,      )   Arizona Supreme Court
    629 INVESTMENTS, A HAWAII          )   No. CV-03-0348-PR
    PARTNERSHIP, REMAINDER INTEREST;   )
    AIMCO PROPERTIES LP;               )   Court of Appeals
    AIMCO/BLOSSOMTREE APTS LP;         )   Division One
    AL-SAID ANNA F T; ALTA PLACE       )   Nos. 1 CA-TX 02-0003
    PROPERTY INC.; ARCADIA VILLA       )        1 CA-TX 02-0013
    APTS, LLC; ARIZONA GRANO-PALMS     )
    LTD; CAMINO APTS; CINNAMON         )   Maricopa County Superior
    PROPERTIES; CON AM REALTY          )   Court
    INVESTORS; COOK INLET REGION OF    )   Nos. TX 98-00413
    ARIZONA INC; DELCASTELLO IRENE     )        TX 98-00419
    TRUST; EQR VILLA MANANA VISTAS     )        TX 98-00422
    INC; EQR-WATSON GP; EQUITY         )
    RESIDENTIAL PROPERTIES; ERP        )
    OPERATING LP; EVANS WITHYCOMBE     )
    FINANCE PSHP SUITE A200; EVANS     )
    WITHYCOMBE FINANCE PARTNERSHIP     )
    LP; EVANS WITHYCOMBE               )
    RESIDENTIAL; EVANS WITHYCOMBE      )
    RESIDENTIAL LP; FOREST PARK LLC;   )
    G & E HOLDINGS INC; GREENWAY       )
    PHOENIX ASSOCIATION LTD            )
    PARTNERSHIP; HEATHERWOOD           )
    INVESTORS LTD PARTNERSHIP;         )
    LAURELS SADDLE CLUB LP; MAGELLAN   )
    NORTHWOOD INC; MARIPOSA JOINT      )     O P I N I O N
    VENTURE; MORARU, PETER &           )
    ELIZABETH; MOUNTAIN VIEW           )
    CASITAS LP; NHP SUMMER LP;         )
    ORCHARD MESA ASSOCIATES LTD        )
    PARTNERSHIP; OTC APARTMENTS LP;    )
    PARKSIDE; PARKSIDE PARTNERSHIP;    )
    PASO ROBLES LLC; PHOENIX           )
    COURTYARDS LTD PARTNERSHIP; PINE   )
    SPRINGS LLC; PROFESSIONAL          )
    PROPERTY INV LTD; SCOTTSDALE       )
    PALMS LTD PARTNERSHIP; SMITH       )
    MELVIN W JR & MARJORIE L TR;       )
    SUNSET SHADOWS INC; SUNSHINE      )
    LAND ASSOCIATES LP; THE PHOENIX   )
    APTS LLC; THE S DEVELOPMENT       )
    COMPANY; THOMSON THOMAS J; TPOC   )
    LTD LIABILITY CO; VERDE           )
    INVESTMENT INC; W. L. PROPERTIES  )
    LLC; WELLSFORD RESIDENTIAL        )
    TRUST; YF PARTNERS GREEN LP       )
    )
    Plaintiffs-Appellees, )
    )
    v.               )
    )
    MARICOPA COUNTY, a political      )
    subdivision of the State of       )
    Arizona,                          )
    )
    Defendant-Appellant. )
    __________________________________)
    )
    ANTHEM DUNLAP SQUARE, LLC, a      )
    limited liability company,        )
    )
    Plaintiff-Appellee, )
    )
    v.               )
    )
    MARICOPA COUNTY, a political      )
    subdivision of the State of       )
    Arizona,                          )
    )
    Defendant-Appellant. )
    __________________________________)
    )
    CENTURY PROPERTIES FUND XIX;      )
    FARNAM COMPANIES INC;             )
    FEIGA/CIMMARON LP; PACIFIC        )
    CORINTHIAN LIFE INSURANCE;        )
    RONALD L. HERRICK TRUSTEE; SANO   )
    CORPORATION; WHITE, HOWELL AND    )
    HALL, LLC,                        )
    )
    Plaintiffs-Appellees, )
    )
    v.               )
    )
    MARICOPA COUNTY, a political      )
    2
    subdivision of the State of       )
    Arizona,                          )
    )
    Defendant-Appellant. )
    __________________________________)
    )
    AILEEN H. CHAR LIFE INTEREST,     )
    629 INVESTMENTS, A HAWAII         )
    PARTNERSHIP, REMAINDER INTEREST; )
    AIMCO PROPERTIES LP;              )
    AIMCO/BLOSSOMTREE APTS LP;        )
    ALSAID ANNA F T; ALTA PLACE       )
    PROPERTY INC; ARCADIA VILLA       )
    APTS. LLC; ARIZONA GRANO-PALMS    )
    LTD; CAMINO APTS; CINNAMON        )
    PROPERTIES; CON AM REALTY         )
    INVESTORS; COOK INLET REGION OF   )
    ARIZONA INC; DELCASTELLO IRENE    )
    TRUST; EQR-WATSON GP; EQUITY      )
    RESIDENTIAL PROPERTIES; ERP       )
    OPERATING LP; EVANS WITHYCOMBE    )
    FINANCE PSHP SUITE A200; EVANS    )
    WITHYCOMBE FINANCE PARTNERSHIP    )
    L.P.; EVANS WITHYCOMBE            )
    RESIDENTIAL; EVANS WITHYCOMBE     )
    RESIDENTIAL LP; FOREST PART LLC; )
    G & E HOLDINGS INC; GLENWAY       )
    PHOENIX ASSOC LED PARTNERSHIP;    )
    LEATHERWOOD INVESTORS LED         )
    PARTNERSHIP; LAURELS SADDLE CLUB )
    LP; MAGELLAN NORTHWOOD, INC;      )
    MARIPOSA JOINT VENTURE; MORARU,   )
    PETER & ELIZABETH; MOUNTAIN VIEW )
    CASITAS LP; NHP SUMMER, L.P.;     )
    ORCHARD MESA ASSOCIATED LTD       )
    PARTNERSHIP; OTC APARTMENTS LP;   )
    PARKSIDE; PARKSIDE PARTNERSHIP;   )
    PASO ROBLES LLC; PHOENIX          )
    COURTYARDS LTD PARTNERSHIP; PINE )
    SPRINGS, LLC; PROFESSIONAL        )
    PROPERTY INV LTD; SCOTTSDALE      )
    PALMS LTD PARTNERSHIP; SMITH      )
    MELVIN W JR & MARJORIE L TR;      )
    SUNSET SHADOWS, INC,; SUNSHINE    )
    LAND ASSOCIATES LP; THE PHOENIX   )
    ARTS LLC; THE S DEVELOPMENT       )
    COMPANY; THOMSON THOMAS J; TPOC   )
    3
    LTD LIABILITY CO; VERDE           )
    INVESTMENTS, INC,; W. L.          )
    PROPERTIES, LLC; WELLSFORD        )
    RESIDENTIAL TRUST; YF PARTNERS    )
    GREEN LP,                         )
    )
    Plaintiffs-Appellants,     )
    Cross-Appellees,     )
    )
    v.               )
    )
    MARICOPA COUNTY, a political      )
    subdivision of the State of       )
    Arizona; and the DEPARTMENT OF    )
    REVENUE OF THE STATE OF ARIZONA, )
    )
    Defendants-Appellees,     )
    Cross-Appellants.     )
    )
    __________________________________)
    Appeal from the Arizona Tax Court
    Nos. TX 98-00413, TX 98-00419, TX 98-00422
    The Honorable Jeffrey S. Cates
    Affirmed in Part; Reversed in Part; Remanded
    Memorandum Decision of Court of Appeals, Division One
    1 CA-TX 02-0003, 1 CA-TX 02-0013, Filed September 2, 2003
    Vacated
    Fennemore Craig, P.C.                                     Phoenix
    by   Paul J. Mooney
    Jim L. Wright
    and Paul Moore
    Attorneys for Aileen H. Char, et al.
    Helm & Kyle, LTD                                            Tempe
    by   Roberta S. Livesay
    and Lisa J. Bowey
    Special Counsel for Maricopa County
    Terry Goddard, Attorney General                           Phoenix
    by   Frank Boucek, III, Assistant Attorney General
    Attorneys for Arizona Department of Revenue
    _________________________________________________________________
    4
    M c G R E G O R, Vice Chief Justice
    ¶1           We granted review to clarify the elements a taxpayer
    must prove to establish discriminatory property tax valuation in
    violation of Arizona’s Uniformity Clause.                     Ariz. Const. art. IX,
    § 1.     We exercise jurisdiction pursuant to Article VI, Section
    5.3 of the Arizona Constitution, Rule 23 of the Arizona Rules of
    Civil Appellate Procedure, and Arizona Revised Statutes (A.R.S.)
    § 12-120.24 (2003).
    I.
    ¶2           A    group   of    property       owners      (the    Taxpayers)      brought
    this action against Maricopa County and the Arizona Department
    of     Revenue     (ADOR)       to     recover       taxes       allegedly     collected
    illegally.         The    Taxpayers      contend       that      the   Maricopa    County
    Assessor         valued     their       apartment          properties         (Taxpayers’
    properties) in a discriminatory manner and thus violated the
    Uniformity       Clause    of    the    Arizona       Constitution,       Article     IX,
    Section 1, and the Equal Protection Clause of the United States
    Constitution, Amendment XIV, Section 1.                      The Taxpayers sought a
    property     tax    refund      under    A.R.S.       §    42-204.C      (Supp.    1997),
    repealed     by    1997    Ariz.       Sess.       Laws,   Ch.    150,    §    9   (repeal
    effective 1999).1
    1
    At the time in question, A.R.S. § 42-204.C stated:
    5
    ¶3         For tax years 1996 and 1997, as in previous years, the
    Maricopa     County   Assessor    implemented      a   computer      program
    (valuation    program)   to   determine      the   values   of   commercial
    properties,     including     multi-family     residential       properties,
    located in Maricopa County.2        The valuation program calculated
    each property’s value using a computerized cost model.                  The
    county assessor, however, programmed the valuation program to
    “roll over” or “freeze” the value of certain parcels.                  If a
    multi-family residential property owner previously had appealed
    the property’s valuation, the valuation program would roll over
    that property’s valuation until one of several actions occurred.3
    __________________
    [W]ithin   one  year   after  payment   of  the   first
    installment of the tax, an action may be maintained to
    recover any tax illegally collected, and if the tax due
    is determined to be less than the amount paid, the
    excess shall be refunded in the manner provided by this
    title. Interest at the legal rate on the overpayment
    shall be payable from the date of overpayment. For the
    purpose of computing interest under any such judgment,
    if the tax was paid in installments, a pro rata share
    of the total overpayment shall be deemed attributable
    to each installment.
    A.R.S. § 42-204.C (Supp. 1997), repealed by 1997 Ariz. Sess.
    Laws, Ch. 150, § 9 (repeal effective 1999).
    2
    We view the record in the light most favorable to upholding
    the tax court’s judgment.     See, e.g., Hutcherson v. City of
    Phoenix, 
    192 Ariz. 51
    , 53 ¶ 13, 
    961 P.2d 449
    , 451 (1998);
    McFarlin v. Hall, 
    127 Ariz. 220
    , 224, 
    619 P.2d 729
    , 733 (1980).
    3
    For example, the assessor would revalue the property rather
    than roll over its valuation if the assessor revalued the
    property’s land, the property owner constructed new improvements
    6
    The valuation of these roll-over properties did not change from
    1996 to 1997.           If the valuation program did not roll over the
    value of a multi-family residential parcel, or if the parcel’s
    value     was    not    manually              entered    into     the    County’s     computer
    system,     the       assessor          retained        the     value    assigned     by   the
    valuation program.
    ¶4              The Taxpayers own sixty-two multi-family residential
    parcels in Maricopa County, all among the group of properties
    that the assessor valued by applying the cost model used as part
    of    the   valuation         program.             The     tax       court,    comparing    the
    valuations        for       1996        and     1997,     found      that     the   Taxpayers’
    properties’ valuations increased by an average of 37.6 percent,
    while the roll-over properties’ valuations remained unchanged.
    The tax court then entered judgment in favor of the Taxpayers
    and     ordered       the     County          to   refund       to    the     Taxpayers    “the
    difference between the 1996 property valuations and the 1997
    increased property valuations of their properties.”                                 The County
    appealed the tax court’s decision.
    ¶5              The   court        of    appeals        reversed.       In    its   memorandum
    decision, the court relied primarily upon its conclusion that
    the tax court “failed to require evidence of disproportionate
    __________________
    or changed the use of the property, or the assessor manually
    changed the property’s value.
    7
    valuation with respect to the properties’ full cash value.”4
    Aileen H. Char Life Interest v. Maricopa County, 1 CA-TX 02-0003
    & 1 CA-TX 02-0013 at ¶ 11 (Ariz. App. Sept. 2, 2003) (mem.
    decision).
    ¶6             The Taxpayers petitioned this court for review.                    We
    accepted       review   to   clarify   the   proper    standard    to   apply     in
    determining whether unlawful discrimination has occurred under
    Arizona’s Uniformity Clause.             We will not set aside the tax
    court’s findings unless clearly erroneous.               Ariz. R. Civ. Proc.
    52(a).     Whether the tax court applied the proper legal standard,
    however, presents a question of law reviewed de novo.                       Transp.
    Ins.     Co.    v.   Bruining, 
    186 Ariz. 224
    ,    226,   
    921 P.2d 24
    ,
    26 (1996).
    II.
    ¶7             The   Arizona   Constitution     requires    that     “all      taxes
    shall be uniform upon the same class of property within the
    territorial limits of the authority levying the tax.”                          Ariz.
    4
    The court of appeals also held that the tax court erred in
    allowing the Taxpayers to voluntarily dismiss Parcel 158-02-005.
    The court concluded that the dismissal of Parcel 158-02-005 did
    not comply with Arizona Rule of Civil Procedure 41(a)(1) because
    “the dismissal was entered in the absence of a stipulation
    signed by the County and the ADOR, and occurred after the court
    had issued findings of fact and conclusions of law.” Aileen H.
    Char Life Interest, 1 CA-TX 02-0003 & 1 CA-TX 02-0013, mem. dec.
    at ¶ 33; see also Ariz. R. Civ. P. 41(a)(1) (“[A]n action may be
    dismissed . . . by order of the court pursuant to a stipulation
    of dismissal signed by all parties who have appeared in the
    8
    Const.    art.   IX,   §   1.    Arizona’s    Uniformity   Clause   provides
    greater protection for taxpayers than does the Equal Protection
    Clause of the Fourteenth Amendment and is designed “to ensure
    ‘that each taxpayer’s property bear the just proportion of the
    property tax burden.’”          Am. West Airlines, Inc. v. Ariz. Dep’t
    of Revenue, 
    179 Ariz. 528
    , 530-31, 
    880 P.2d 1074
    , 1076-77 (1994)
    (quoting Merris v. Ada County, 
    593 P.2d 394
    , 398 (Idaho 1979)).
    ¶8           Four general elements comprise the formula by which
    Arizona    measures    a   property    tax:   classification,    valuation,
    assessment ratio, and tax rate.            See, e.g., Berge Ford, Inc. v.
    Maricopa County, 
    172 Ariz. 483
    , 485, 
    838 P.2d 822
    , 824 (Tax Ct.
    1992).     The first step, classification, involves the exercise of
    legislative      power.         Exercising    this   power,   the      Arizona
    legislature has established statutory classes of property.                 See
    A.R.S. §§ 42-12001 to -12010 (Supp. 2003).             For most property in
    Arizona,     a   county    assessor    carries   out    the   second     step,
    valuation.       An assessment ratio, dictated by the legislative
    classification, is then applied to the valuation.             See A.R.S. §§
    42-15001 to -15010 (Supp. 2003).              This result represents the
    property’s assessed value.          Finally, the applicable tax rate is
    applied to the property’s assessed value to produce the amount
    of taxes due.
    __________________
    action.”).   We agree and adopt this holding of the court of
    appeals.
    9
    ¶9             In this case, the Taxpayers’ challenge involves the
    second step in the property tax formula, the county assessor’s
    valuation of their properties.                 The Taxpayers do not argue that
    the assessor valued their properties in excess of full cash
    value, placed them in the wrong legislative classification, or
    applied a discriminatory tax rate or assessment ratio.                           Instead,
    the Taxpayers argue that the alleged undervaluation of similarly
    situated properties resulted in the Taxpayers being forced to
    bear a disproportionate share of the property tax burden.                             We
    use the term “discriminatory valuation” to describe this type of
    case.
    ¶10            We defined the elements a taxpayer must prove to make
    out a case of discriminatory valuation in McCluskey v. Sparks,
    
    80 Ariz. 15
    ,    19,   
    291 P.2d 791
    ,     793   (1955).      In    McCluskey,
    without       determining       whether    the      particular      facts    presented
    amounted       to    discrimination       in      violation    of    the    Uniformity
    Clause,       we    concluded     that    the     “[d]eliberate      and    systematic
    undervaluation of [a taxpayer’s] property at a figure greatly in
    excess of the undervaluation of other like properties amounts to
    a    violation      of   the   Arizona    [C]onstitution.”           
    Id.
         To     prove
    discriminatory valuation, then, a taxpayer must establish (1)
    that the taxing officials engaged in deliberate and systematic
    conduct       and     (2)      that   such        conduct     resulted      in     “great
    inequality,” a finding that requires the court to define the
    10
    appropriate     class         of   property      for     evaluating       the      claim       of
    discriminatory           valuation         and         then      to       find          greatly
    disproportionate tax treatment within the defined class.
    ¶11          The County asserts that the Taxpayers must prove each
    element of their prima facie case beyond a reasonable doubt.
    The authority upon which the County relies for that proposition,
    however,   refers        to    challenges     to      the     constitutionality           of   a
    statute.      See,       e.g.,     Magellan      S.    Mountain        Ltd.   v.    Maricopa
    County, 
    192 Ariz. 499
    , 
    968 P.2d 103
     (App. 1998) (holding that
    statute,     which       allowed     revaluation          of     real    property        after
    January 1 of the valuation year, did not violate the federal
    Equal Protection Clause or the Uniformity Clause); Tucson Elec.
    Power Co. v. Apache County, 
    185 Ariz. 5
    , 
    912 P.2d 9
     (App. 1995)
    (holding that provision of tax statute taxing mining and utility
    properties    at     a   higher     rate    than       other     properties        to    be    an
    unconstitutional         special     law).         This       matter     involves        not    a
    challenge to the constitutionality of a statute, but a claim
    that the County imposed a discriminatory tax on the Taxpayers.
    We perceive no reason to depart from the usual rule that a
    plaintiff must establish each element of a civil action by a
    preponderance      of     the      evidence,       and      we    hold    that      standard
    applies.
    11
    A.
    ¶12         In    a    discriminatory         valuation       case,    “there       must     be
    something more than a dispute between the taxpayers and the
    taxing     officials      as     to     the        valuation       placed     upon        their
    properties.”          McCluskey,       
    80 Ariz. at 19
    ,    
    291 P.2d at 794
    .
    “Before the court will interfere, it must be clearly shown that
    assessments which are unequal are the result of systematic and
    intentional conduct and not mere error in judgment.”                            
    Id. at 20
    ,
    
    291 P.2d at 794
    .         Moreover, “[t]he mere fact that the assessing
    officials believed their conduct was valid does not render it
    less vulnerable to attack as discriminatory.”                             
    Id.
           Finally,
    deliberate and systematic conduct need not be malicious, only
    purposeful.
    ¶13         The       County    does        not     seriously       dispute        that     the
    challenged valuations resulted from systematic and intentional
    conduct.     At the time in question, Arizona statutes limited the
    circumstances         under    which    an        assessor     could      “roll     over”    a
    property valuation:
    In the year subsequent to an appeal, the valuation or
    classification of property shall be the valuation or
    classification that was determined in the prior year at
    the highest level of appeal unless the assessor reviews
    the current facts which apply to a revaluation or a
    change in the classification and determines that an
    adjustment in the valuation or a change in the
    classification is appropriate.
    12
    A.R.S. § 42-247.A (Supp. 1997), repealed by 1997 Ariz. Sess.
    Laws, Ch. 150, § 9 (repeal effective 1999); see also A.R.S. §
    42-16002.B (Supp. 2003).             Despite the language of A.R.S. § 42-
    247.A, the County developed and implemented a policy to “roll
    over” property values on certain apartment parcels for more than
    one   year.        To   do   so,    the   assessor    programmed     the    County’s
    computer system to roll over the value of certain properties,
    while using the cost model to determine the valuation of other
    properties.        The evidence at trial indicated that this program
    resulted in the County rolling over the values of approximately
    fifty percent of the apartment parcels but valuing more than
    forty percent of the apartment parcels, including the Taxpayers’
    properties, using the cost model.                 The Taxpayers, therefore, met
    their burden of establishing that the County intentionally and
    systematically used a method of valuing their property different
    from that the County used to value the roll-over properties.
    ¶14           As   we   made    clear     in    McCluskey,     however,    “different
    modes   of    assessment       on   the   same    class   of    property    will   not
    render the same invalid unless in fact they operate to produce
    discriminatory inequality.”               
    80 Ariz. at 20
    , 
    291 P.2d at 794
    ;
    see also Sec. Props. v. Ariz. Dep’t of Prop. Valuation, 
    112 Ariz. 54
    , 56, 
    537 P.2d 924
    , 926 (1975) (“Neither the change in
    value of a particular parcel of property nor the total changes
    in assessments considered in the aggregate raise any question as
    13
    to the legality of the assessment.                  There must be more.”).              We
    therefore turn to the issue of whether the County’s program
    resulted in great inequality.                  To make this determination, we
    must first determine the appropriate class for evaluating the
    Taxpayers’ claim of discriminatory valuation.
    B.
    ¶15            Arizona’s      Uniformity       Clause    requires       that    taxes    be
    uniform upon the same class of property.                      Ariz. Const. art. IX,
    §     1.      We    examined     the    meaning     of    the    word    “class,”       for
    Uniformity Clause purposes, in Apache County v. Atchison, Topeka
    and Santa Fe Railway Co., 
    106 Ariz. 356
    , 
    476 P.2d 657
     (1970).
    In that case, we stated:
    A class may be the grouping together of persons or
    things for a common purpose or it may be a ranking of
    persons or things possessing the same attributes. . . .
    The word “class,” however, in Article IX, § 1 is
    obviously used in the latter sense, meaning the
    grouping of persons or things possessing common
    attributes.
    Id. at 359, 
    476 P.2d at 660
     (citations omitted).                               As Apache
    County and our subsequent decisions make clear, the proper class
    of    property       to   use    in    evaluating       claims    of    discriminatory
    valuation          consists     of    those    similarly        situated       properties
    possessing         common     attributes      “based     on     the    nature    of     the
    property or on some other real difference in its use, utility,
    or productivity.”             Am. West Airlines, Inc., 
    179 Ariz. at 535
    ,
    
    880 P.2d at 1081
    .
    14
    ¶16            In this case, the tax court found that the “multi-
    family     residential       property        classification     is     a     valid
    classification to which an unlawful tax discrimination analysis
    can be applied.”         Relying on Hillock v. Bade, 
    22 Ariz. App. 46
    ,
    
    523 P.2d 97
     (1974), aff'd, 
    111 Ariz. 585
    , 
    535 P.2d 1302
     (1975),
    the County argues that the tax court erred by not defining the
    relevant class as all property in Maricopa County.5                 We disagree.
    In     Hillock,   a   taxpayer   challenged       Pima   County’s     three-year
    cyclical revaluation plan mandated by a statewide revaluation
    program.       
    22 Ariz. App. at 49
    , 
    523 P.2d at 100
    .           In holding that
    “the    Pima    County   cyclical   revaluation      plan     did    not   involve
    intentional and arbitrary discrimination,” the court explained
    that a number of factors were relevant to this determination,
    5
    The County also argues that the inclusion of some
    “horizontal regimes” and “associated parcels” destroys the
    homogeneity of the “multi-family residential” classification.
    According to the tax court’s findings, “horizontal regimes” are
    individual apartment units with separate parcel numbers.
    “Associated parcels,” on the other hand, contain a portion of an
    apartment complex, but have separate parcel numbers from the
    rest of the complex.     Although the County presented evidence
    that the existence of these properties rendered the Taxpayers’
    proffered class improper, the tax court, after considering the
    County’s arguments, found that “the County failed to show how
    the inclusion and exclusion of these properties has any
    significant effect on the necessary discrimination analysis.”
    We find no error in the tax court’s finding.        In addition,
    contrary to the County’s assertions, the tax court’s finding
    does not indicate that the tax court improperly shifted the
    burden of proof to the County.     Instead, the record is clear
    that the tax court placed the burden of proof on the Taxpayers
    to make out a prima facie case of discriminatory valuation.
    15
    including any discrimination that would result if the cyclical
    plan were not instituted immediately.      Specifically, the court
    examined and rejected the taxpayer’s proposed alternative that
    “the taxing authorities should have waited until the completion
    of the three year revaluation program so that all new valuations
    could be placed on the assessment rolls at the same time.”      Id.
    at 53-54, 
    523 P.2d at 104-05
    .    The court reasoned:
    [The taxpayer’s] discrimination claim must be viewed in
    a context involving all property situated in the State
    of Arizona subject to ad valorem property taxation. . .
    . Therefore to the extent that any particular type of
    property   is  undervalued,   there   is discrimination
    against all other property within the state, not just
    against property of that particular class within the
    particular county involved.    When these circumstances
    are considered, we do not believe that the taxing
    authorities acted arbitrarily in adopting a cyclical
    three year plan requiring that the new valuations be
    placed on the assessment rolls yearly as developed,
    rather than waiting until all of the new valuations
    could be placed upon the rolls at the same time at the
    completion of the three year program.
    Id. at 54, 
    523 P.2d at 105
    .
    ¶17          The language of Hillock, taken out of context, can be
    read as supporting the broad proposition the County advances.
    Hillock, however, did not mandate the use of geographic criteria
    to define a peer group of properties to prove discriminatory
    valuation.     Instead, Hillock recognized the distinction between
    systematic reappraisal and intentional discrimination.6    Indeed,
    6
    At the time the Taxpayers brought suit, A.R.S. § 42-221.B
    stated:
    16
    if the tax court in this case had found the appropriate class to
    be all properties in Maricopa County, we doubt that class would
    have possessed common attributes “based on the nature of the
    property or on some other real difference in its use, utility,
    or productivity.”       Am. West Airlines, Inc., 
    179 Ariz. at 535
    ,
    
    880 P.2d at 1081
    ; Apache County, 
    106 Ariz. at 359
    , 
    476 P.2d at 660
    .
    ¶18         As   the   County   points    out,   the   legislature   has   not
    exercised its power to create statutory classes of property to
    create a separate classification for “multi-family residential”
    property.    The “multi-family residential” classification adopted
    __________________
    In the case of property that is classified as class
    four, five or six pursuant to § 42-162, the assessor
    may use the same valuation for up to three consecutive
    tax years if the assessor files a specific plan for
    such valuations with the department and the plan is
    implemented uniformly throughout the county.
    A.R.S. § 42-221.B (Supp. 1997), repealed by 1997 Ariz. Sess.
    Laws, Ch. 150, § 9 (repeal effective 1999); see also A.R.S. §
    42-13052 (Supp. 2003).      Class six property, at the time,
    encompassed real and personal property “devoted to use as leased
    or rented property solely for residential purposes.”    A.R.S. §
    42-162.A.6(a) (Supp. 1997), repealed by 1997 Ariz. Sess. Laws,
    Ch. 150, § 9 (repeal effective 1999); see also A.R.S. § 42-
    12004.A.1 (Supp. 2003) (classifying real and personal property
    “used solely as leased or rented property for residential
    purposes” as class four property). Had the County followed the
    dictates of A.R.S. § 42-221.B in this case, Hillock very well
    may have supported reaching a different result.     Arguably, if
    the County had filed a three-year valuation plan with the ADOR
    and implemented the plan uniformly throughout the county, its
    conduct would not have caused intentional and systematic
    discrimination.   Because the record contains no evidence that
    17
    by the tax court, however, comes directly from the coding system
    the    County      uses     to    identify      property       within    the     county     for
    assessment purposes.
    ¶19              Arizona’s       statutes      give     the    ADOR    general       oversight
    responsibilities for Arizona’s property tax system.                                  A.R.S. §
    42-141 (Supp. 1997), repealed by 1997 Ariz. Sess. Laws, Ch. 150,
    § 9 (repeal effective 1999); see also A.R.S. §§ 42-11051 to -
    11056       (1999);     A.R.S.      §    42-13002       (1999).         At     the   time    in
    question, the relevant statute directed that the county assessor
    “determine         through       the     use     of    the     manuals       furnished      and
    procedures described by the department the full cash value of
    all such property, as of January 1 of the next year.”                                A.R.S. §
    42-221.B (Supp. 1997), repealed by 1997 Ariz. Sess. Laws, Ch.
    150,    §    9    (repeal    effective         1999);    see    also     A.R.S.      §   11-542
    (Supp. 2003) (requiring the county assessor to determine “all
    the taxable property in said county at its full cash value”);
    A.R.S. § 42-13051.B.2 (1999).                    To carry out this directive, the
    County uses the ADOR’s Property Use Code Manual (the Manual),
    which contains those codes that the ADOR authorizes for use in
    the Arizona property tax system.                      The ADOR intends that county
    assessors         and   others         use     the    Manual    for      the    purpose      of
    __________________
    the County filed such a plan in this case, we do not resolve
    this issue.
    18
    identifying property according to use.                Arizona Department of
    Revenue, Property Use Code Manual at Foreword (1994).
    ¶20          According to the Manual, “[t]he purpose of property
    use   codes     is   to    group     and     code     like      properties         for
    identification.”        Id. at 1 (emphasis added).              Consistent with
    this purpose, the Manual sets out property use codes beginning
    with the prefix “03” to identify properties with multi-family
    residential property characteristics.               The tax court found that
    the Taxpayers’ properties fit within this group and, in fact,
    had been so coded by the assessor.                Because the identification
    of property as “multi-family residential” accurately reflects
    the property’s use, we agree with the tax court that this class
    is    appropriate    for     evaluating       the     Taxpayers’          claim    of
    discriminatory valuation.         We therefore turn to the tax court’s
    determination that the Taxpayers’ properties were subject to a
    disproportionate     valuation     when    compared     to    other       properties
    within the same class.
    C.
    ¶21          To determine the proper standard for deciding whether
    the     government’s       actions         have      produced         a      greatly
    disproportionate valuation, we turn again to the language of the
    Uniformity    Clause,     which   requires    that     “all    taxes       shall   be
    uniform upon the same class of property within the territorial
    limits of the authority levying the tax.”              Ariz. Const. art. IX,
    19
    § 1.    As this language makes clear, it is the tax paid, not the
    numerical values assigned to property, that must be uniform.
    Accordingly, to prevail in a valuation discrimination case, a
    plaintiff      must    show       tax   treatment      greatly    unequal7    to   that
    afforded others in the same class and must do so by reference to
    full cash value.            See, e.g., S. Pac. Co. v. Cochise County, 
    92 Ariz. 395
    , 
    377 P.2d 770
     (1963); McCluskey, 
    80 Ariz. at 19
    , 
    291 P.2d at 793
    .         In   McCluskey,      we   summarized      the   plaintiffs’
    argument as follows:
    Plaintiffs’ lawsuit in this case is based upon the
    alleged   proposition   that    plaintiffs   have   been
    discriminated against by valuing other properties at
    below full cash value and, by the use of a method
    different from that used in valuing other properties,
    assessing   or   attempting    to   assess   plaintiffs’
    properties at a greatly disproportionate valuation.
    
    80 Ariz. at 19
    ,    
    291 P.2d at 793
    .     We   then    concluded    that
    “[a]ssessing officials cannot systematically and intentionally
    use different rules for measuring the value of property of the
    same class if by the use thereof great inequality results.”                         
    Id. at 20
    , 
    291 P.2d at 794
    .
    ¶22           Similarly,          in    Southern       Pacific,   the      challenging
    taxpayer alleged that “its property was assessed at not less
    7
    The requirement that a taxpayer show greatly unequal
    treatment reflects the fact that the “valuation of real
    property, whether done for taxation or investment purposes, is
    not subject to mathematical certainty” and that the assessment
    of taxes, therefore, need not be exactly equal. Bus. Realty of
    20
    than 89 per cent of full cash value but that other property
    subject to assessment by the respective county assessors was
    assessed at no more than 20 per cent of full cash value on the
    average.”          
    92 Ariz. at 398
    , 
    377 P.2d at 772
    .                We concluded that
    “[i]f       [a    taxpayer]       establishes      that      its   property    is    being
    assessed at a higher percentage of full cash value than other
    properties, then . . . discrimination . . . will have been
    shown.”          
    Id. at 403
    , 
    377 P.2d at 776
    .
    ¶23               Although neither McCluskey nor Southern Pacific holds
    that    a    taxpayer       can    show   disproportionate         valuation    only   by
    reference to full cash value, the structure of Arizona’s tax
    system      requires       that    taxpayers      in    a    discriminatory    valuation
    case     demonstrate         disproportional           valuation    using     full    cash
    value.
    ¶24               For tax purposes, Arizona values all real property at
    full cash value.             A.R.S. § 42-221.B (Supp. 1997), repealed by
    1997 Ariz. Sess. Laws, Ch. 150, § 9 (repeal effective 1999); see
    also A.R.S. § 42-13051.B (1999).                   Under Arizona statutes, “full
    cash     value,”      for     property      tax    purposes,       means    “that    value
    determined as prescribed by statute.                        If no statutory method is
    prescribed,         full    cash    value   is    synonymous       with    market    value
    which means that estimate of value that is derived annually by
    __________________
    Ariz., Inc. v. Maricopa County, 
    181 Ariz. 551
    , 557, 
    892 P.2d 1340
    , 1346 (1995).
    21
    the use of standard appraisal methods and techniques.”                      A.R.S. §
    42-201.4 (Supp. 1997), repealed by 1997 Ariz. Sess. Laws, Ch.
    150, § 9 (repeal effective 1999); see also A.R.S. § 42-11001.5
    (Supp. 2003).
    ¶25          To establish a greatly disproportionate valuation, a
    taxpayer must present evidence from which the court can compare
    the valuation of the disfavored properties as a percentage of
    their   full   cash   value    and    the       valuation   of    other     similarly
    situated properties within the same class as a percentage of
    their   full   cash   value.         The    taxpayer     bears     the    burden    of
    demonstrating the difference between a property’s valuation and
    what the property’s value should have been.8                     Once the taxpayer
    presents   such   evidence,     the    court       can   determine       whether   the
    taxpayer’s     property   was    valued         “greatly    in     excess    of    the
    undervaluation of other like properties.”                   McCluskey, 
    80 Ariz. at 19
    , 
    291 P.2d at 793
    .
    ¶26          In this case, the tax court found that “the improper
    roll over of valuation for properties similarly situated to [the
    Taxpayers’] properties resulted in a disproportional valuation
    of [the Taxpayers’] properties.”                Although the tax court did not
    specify the legal standard upon which it based this finding,
    8
    “Valuation” refers to the final value placed upon a piece
    of property by the taxing authority.  “Full cash value” refers
    to the amount required by statute or, otherwise stated, the
    amount a valuation should have been.
    22
    evidence of record, measured against the standard defined above,
    supports the trial court’s finding.9                    The assessor valued the
    Taxpayers’    properties      by    using      the    cost    approach.10       As   our
    statutes instruct, we presume that the County’s determination of
    the value of a taxpayer’s property is correct.                    See A.R.S. § 42-
    16212.C (Supp. 2003).          Applying that presumption, the assessed
    values for the Taxpayers’ properties, taken from the County’s
    data, show both what the valuation of the Taxpayers’ properties
    should   have   been    and    the    valuation,         in    fact,    given    those
    properties.      Because,      as    to     the      Taxpayers’   properties,        the
    measures are the same, the Taxpayers’ properties were valued at
    one hundred percent of their full cash value.
    ¶27          As noted above, the County used a different method to
    value the roll-over properties and left the 1996 valuation of
    these    properties    unchanged.            To      establish    their     claim     of
    disproportionate      valuation,      the       Taxpayers      needed     to   present
    9
    We will uphold a trial court’s factual findings if they
    are supported by competent evidence.     See, e.g., Federoff v.
    Pioneer Title & Trust Co. of Ariz., 
    166 Ariz. 383
    , 388, 
    803 P.2d 104
    , 109 (1990).
    10
    The assessor used the cost approach method to determine
    “full cash value” in compliance with A.R.S. § 42-11001.5, which
    states, in part, that “[i]f no statutory method [for determining
    full cash value] is prescribed, full cash value is synonymous
    with market value which means the estimate of value that is
    derived annually by using standard appraisal methods and
    techniques.” The County apparently regarded the cost method as
    being a standard appraisal technique and thus in compliance with
    23
    evidence to support their claim that the roll-over valuations
    differed from the full cash value of those properties.                           The
    Taxpayers    made    this   showing      by    introducing    as   evidence      the
    values derived by applying the cost model to calculate the full
    cash value of the improvements to the roll-over properties.                      The
    Taxpayers then combined this recalculated improvement value with
    the full cash value of the roll-over properties’ land, again as
    determined by the County’s own figures.                  Taken together, this
    evidence    shows    that   the    roll-over     properties    were     valued    at
    sixty-six percent of their full cash value while the Taxpayers’
    properties    were    valued      at   one    hundred   percent    of   full   cash
    value.      Through this evidence, the Taxpayers established the
    elements of their claim of greatly disproportionate valuation.
    ¶28         The County, of course, was free to disprove any of the
    Taxpayers’ contentions when it presented its defense.                      Rather
    than do so, the County incorrectly insisted that the Taxpayers,
    as part of their case in chief, bore the burden of disproving
    all   potential      explanations       for    the   disparity     in   valuation
    between the two groups of properties.
    ¶29         The County’s primary argument involves the Taxpayers’
    failure to show the value of the land portion of the roll-over
    properties.     As the County points out, the land values for the
    __________________
    the statutory requirement, and the Taxpayers do not dispute the
    use of the cost method to determine full cash value.
    24
    Taxpayers’         properties      decreased           approximately        twenty-five
    percent from 1996 to 1997, while the land values for the roll-
    over     properties      apparently     remained        unchanged.          The   County
    argues that because the Taxpayers failed to present evidence
    indicating        what   the   land   values      of    the   roll-over     properties
    would have been had they also been revalued, the tax court could
    not determine the extent to which the roll-over properties’ land
    values      were     overvalued.        Because         the    Taxpayers      did    not
    accurately evaluate both the land and the improvements of the
    roll-over properties, the County asserts, the Taxpayers’ proof
    violates the unitary theory of valuation.                     Transamerica Dev. Co.
    v. County of Maricopa, 
    107 Ariz. 396
    , 399, 
    489 P.2d 33
    , 36
    (1971) (“[P]roperty valuation must be considered one subject,
    not    to    be     broken     into    separate         components     of    land    and
    improvements. . . .             In other words, if the total valuation
    represents the full cash value of the property, it is immaterial
    for purposes of appeal that one part is overvalued and the other
    is undervalued.”).
    ¶30          The County could have presented evidence, if such were
    available,11        to     rebut      the        Taxpayers’      evidence         showing
    11
    Our own review of the evidence of record suggests that,
    even if the land values for the roll-over properties were
    reduced by twenty-five percent, the greatly disproportionate
    valuation found by the trial court remains.     In fact, because
    land values account for less than twenty percent of the value of
    25
    disproportionate valuation.      But the responsibility for doing so
    rested with the County as its defense to the showing made by the
    Taxpayers.     The tax court, having heard and weighed the evidence
    presented     by   the   Taxpayers    and     the   County,     accepted   the
    Taxpayers’    proffered    evidence    of     disproportionate      valuation.
    The evidence of record provides a sufficient basis to support
    the tax court’s finding that the Taxpayers were the subject of a
    disproportionate     valuation   in        violation   of     the   Uniformity
    Clause.
    III.
    ¶31          The County also challenged the tax court’s choice of
    remedy.      The tax court ordered that “the County refund [the
    Taxpayers] the difference between the 1996 property valuations
    and the 1997 increased property valuations of their properties.”
    In so ordering, the tax court relied on                Gosnell Development
    Corp. v. Arizona Department of Revenue, 
    154 Ariz. 539
    , 
    744 P.2d 451
     (App. 1987), in which the court stated:
    There can be no question that under applicable case
    law, Gosnell has been the victim of unconstitutional
    discrimination.     That unequal treatment must be
    remedied.   In the numerous cases in which a taxpayer
    was adjudged to have been deprived of equal protection
    under the law as a result of unequal tax treatment, the
    taxpayer’s remedy is that which places him on a par
    with the favored taxpayers. . . . “If a ruling is or
    should be prospective only, the past tax can no longer
    be said to be validly imposed even though, by itself,
    __________________
    both groups of properties, a greatly disproportionate valuation
    would likely remain even if the land values are reduced to zero.
    26
    it falls squarely under the coverage of some tax-
    imposing [law]. . . .    Conversely, to the extent the
    amount of the tax has already been collected, it
    becomes an ‘overpayment’ which is subject to refund . .
    . .”
    
    Id. at 542
    , 
    744 P.2d at 454
     (quoting Int’l Bus. Mach. Corp. v.
    United   States,   
    343 F.2d 914
    ,    920    (Ct.    Cl.     1966)    (emphasis
    added));    see also     A.R.S. § 42-11005.B (1999) (“If the court
    determines that the tax due is less than the amount paid, the
    excess shall be refunded . . . .”).
    ¶32          The court of appeals again reached that conclusion in
    Scottsdale Princess Partnership v. Department of Revenue, 
    191 Ariz. 499
    , 
    958 P.2d 15
     (App. 1997).                   The Scottsdale Princess
    Partnership sought a refund of property taxes paid under protest
    for the 1993 and 1994 tax years.                The Partnership argued that
    Arizona’s     possessory     interest        taxing     scheme     violated     the
    Uniformity    Clause   because     it    impermissibly         created    a   taxing
    classification based on the time period at which the property
    interest was created12 instead of the “nature, use, utility, or
    productivity of the taxed property.”               
    Id. at 502
    , 
    958 P.2d at 18
    .   After agreeing that the time-based classification violated
    Arizona’s    Uniformity     Clause,      the   court,    relying     on    McKesson
    12
    The taxing scheme taxed property interests differently,
    depending on whether the property interest was created before or
    after April 1, 1985. Scottsdale Princess, 
    191 Ariz. at 502
    , 
    958 P.2d at 18
    .
    27
    Corp. v. Division of Alcoholic Beverages & Tobacco, 
    496 U.S. 18
    (1990), and Gosnell, concluded:
    The appropriate remedy for such discrimination is a
    refund in the amount necessary to make [the non-favored
    taxpayer’s] tax burden uniform with that of the
    unconstitutionally favored taxpayers; that is, a refund
    of the difference between the amount of taxes . . .
    actually paid and the amount it would have paid had it
    qualified for the special treatment . . . .
    Scottsdale Princess, 
    191 Ariz. at 505
    , 
    958 P.2d at 21
    .
    ¶33        We apply the approach taken in Gosnell and Scottsdale
    Princess for a number of reasons.        Most importantly, Arizona law
    requires a taxpayer to pay any taxes due before challenging the
    validity or amount of the tax.          See A.R.S. § 42-11004 (1999).13
    In McKesson, the United States Supreme Court, addressing the
    appropriate   remedy   for   a    Florida    liquor   tax   scheme   that
    unconstitutionally discriminated against interstate commerce in
    13
    A.R.S. § 42-11004 states:
    A person on whom a tax has been imposed or levied under
    any law relating to taxation may not test the validity
    or amount of tax, either as plaintiff or defendant, if
    any of the taxes:
    1. Levied and assessed in previous years against the
    person’s property have not been paid.
    2. That are the subject of the action are not paid
    before becoming delinquent.
    3. Coming due on the property during the pendency of
    the action are not paid before becoming delinquent.
    A.R.S. § 42-11004; see also A.R.S. § 42-204.A (Supp. 1997),
    repealed by 1997 Ariz. Sess. Laws, Ch. 150, § 9 (repeal
    effective 1999).
    28
    violation of the Commerce Clause,14 concluded that if a state
    “relegates [a taxpayer] to a postpayment refund action in which
    he can challenge the tax’s legality, the Due Process Clause of
    the   Fourteenth         Amendment      obligates       the     State         to    provide
    meaningful         backward-looking            relief         to        rectify          any
    unconstitutional         deprivation.”          
    496 U.S. at 31
            (footnote
    omitted).     Although McKesson involved a challenge brought under
    the federal Commerce Clause, denying any refund to the Taxpayers
    could raise constitutional due process issues.                          In addition to
    raising due process concerns, denying the Taxpayers a refund
    provides limited incentive for taxing authorities to adhere to
    the Arizona constitutional mandate that all taxes “be uniform
    upon the same class of property within the territorial limits of
    the authority levying the tax.”             Ariz. Const. art. IX, § 1.                  The
    relatively    minor       costs   associated       with       defending        against    a
    taxpayer’s    suit    to    recover     illegally       collected        taxes      provide
    only limited incentive for taxing authorities to refrain from
    imposing     taxes       questionable      under      the      Uniformity           Clause.
    Finally, the County presented no proof that ordering a refund to
    the Taxpayers will do great harm to the public coffers.                              See S.
    Pac. Co., 
    92 Ariz. at 406
    , 
    377 P.2d at 778
    .
    ¶34          For   the     foregoing    reasons,      to    place       the    Taxpayers’
    properties    on    par    with   the    favored      roll-over         properties,      we
    14
    U.S. Const. art. I, § 8, cl. 3.
    29
    conclude that the appropriate remedy is that which the tax court
    ordered:    The     County     must      refund      the     difference       between    the
    amount the Taxpayers paid as property taxes in 1997 and the
    amount they would have paid had they been treated in the same
    manner as the roll-over properties.                       We remand to the tax court
    to determine the appropriate refund for each property.
    IV.
    ¶35          The court of appeals reversed the tax court’s judgment
    because     it    concluded       that       the    tax    court   failed      to   require
    evidence     of     disproportionate           valuation      with     respect      to   the
    properties’ full cash value.                 Consequently, the court of appeals
    did   not   reach     a     number      of    other       issues   raised      on   appeal,
    including    whether        the    County’s         actions    were    intentional       and
    systematic, whether a new trial was necessary on the issue of
    alleged new evidence, whether the tax court properly awarded
    attorney fees and expert witness fees, and whether the tax court
    improperly        defined      the       appropriate         class     or     ordered     an
    inappropriate remedy.
    ¶36          We have concluded that the tax court properly defined
    the appropriate class, acted within its discretion in finding
    discrimination and that the County’s actions were intentional
    and systematic, and ordered a proper remedy.                         We can resolve the
    remaining        issues   on      the    record      before    us.          Therefore,    we
    consider whether the tax court abused its discretion in denying
    30
    the County’s motion for new trial and the parties’ arguments
    regarding attorney fees and expert witness fees.
    A.
    ¶37         The County appealed the tax court’s judgment in favor
    of the Taxpayers.          After identifying “new evidence,” however,
    the County moved to suspend the appeal and revest jurisdiction
    in the tax court to allow that court to consider a motion for
    relief from judgment brought pursuant to Arizona Rule of Civil
    Procedure 60(c).         The court of appeals granted the motion and
    revested jurisdiction in the tax court.
    ¶38         The County based its Rule 60(c) motion on its claim
    that, after trial, it discovered that 4,002 of the roll-over
    properties “were rolled over as the result of a mistake, not as
    a matter of intent.”          The County maintained that a mistake in
    encoding these properties resulted in the tax court erroneously
    finding that the “values for 4,297 properties were rolled over
    because the properties had been subject to a September increase
    in    value.”     The    County   claimed    that   its   discovery     of     this
    mistake warranted Rule 60(c) relief.
    ¶39         The    tax    court   denied    the   County’s    motion,    stating
    first that the County’s claimed “new evidence,” even if true,
    would not have changed the court’s decision.              The tax court also
    concluded   that    the    County   “did    not   establish    that     with   due
    diligence it could not have discovered this evidence in time to
    31
    move for a new trial.”            We review a trial court’s denial of a
    motion for relief from judgment under Rule 60(c) for an abuse of
    discretion.        City of Phoenix v. Geyler, 
    144 Ariz. 323
    , 328, 
    697 P.2d 1073
    , 1078 (1985); De Gryse v. De Gryse, 
    135 Ariz. 335
    ,
    336, 
    661 P.2d 185
    , 186 (1983).
    ¶40          Rule 60(c) allows a court to relieve a party from a
    final judgment for, among other reasons, “mistake, inadvertence,
    surprise,     or     excusable     neglect,”      on   the    basis      of   “newly
    discovered evidence which by due diligence could not have been
    discovered in time to move for a new trial under Rule 59(d),”15
    or for “any other reason justifying relief from the operation of
    the judgment.”          Ariz. R. Civ. P. 60(c)(1), (2), (6).                    “The
    standard     for    determining     whether      conduct     is    ‘excusable’    is
    whether the neglect or inadvertence is such as might be the act
    of a reasonably prudent person under the same circumstances.”
    Geyler, 
    144 Ariz. at 331
    , 
    697 P.2d at 1081
    .
    ¶41          The    record   in    this   case    supports        the   tax   court’s
    ruling.     The County possessed the evidence on which it relied in
    its   Rule    60(c)     motion     throughout      the     lengthy       litigation,
    although     it    apparently     determined     its   purported        significance
    only after the court entered judgment.                   As a result, the tax
    15
    Rule 59(d) states: “A motion for new trial shall be filed
    not later than 15 days after entry of the judgment.” Ariz. R.
    Civ. P. 59(d).
    32
    court     acted     within   its    discretion        in    denying    the   County’s
    motion.
    B.
    ¶42           Arizona’s      statutes      permit       the   Taxpayers,     as      the
    prevailing parties in an action challenging the assessment or
    collection of taxes, to recover reasonable attorney fees and
    other expenses.        A.R.S. § 12-348.B (2003).              Using this statutory
    authority, a court “may award fees and other expenses to any
    party . . . which prevails by an adjudication on the merits in
    an action brought by the party against this state or a city,
    town or county challenging . . . [t]he assessment or collection
    of taxes.”        A.R.S. § 12-348.B.1.                “Fees and other expenses”
    “include the reasonable expenses of expert witnesses” along with
    “reasonable and necessary attorney fees.”                  A.R.S. § 12-348.I.1.
    ¶43           Subsection E of the statute, however, provides that
    such an award for fees “shall not exceed thirty thousand dollars
    for fees incurred at each level of judicial appeal.”                         A.R.S. §
    12-348.E.5.          The   tax   court,    based      on   its     interpretation     of
    section 12-348, awarded the Taxpayers, as the prevailing party,
    $30,000.00     as     attorney     fees.        The   Taxpayers       appealed     their
    award, arguing that the plain language of A.R.S. § 12-348.B,
    E.3,    and    E.5    contemplates        multiple      awards      when   there     are
    multiple plaintiffs and that public policy goals support its
    interpretation        of   the   statute,       which      would    permit   each     of
    33
    multiple plaintiffs represented by the same attorney to recover
    up to $30,000.00 for attorney fees.                                 The County contends that
    multiple parties represented by the same attorney can receive
    only one award, capped at $30,000.00, for each level of appeal.
    To    hold     otherwise,        the       County         argues,         would      be    to        grant
    plaintiffs a windfall.                The proper interpretation of a statute
    is a question of law that we review de novo.                                         See Bilke v.
    State, 
    206 Ariz. 462
    , 464 ¶ 10, 
    80 P.3d 269
    , 271 (2003).
    ¶44            In    resolving       this           question,        we   look       first      to    the
    language of the statute, which supports the argument that each
    party     is      entitled      to     an       award          of    attorney        fees,      up     to
    $30,000.00.              Id.   at     ¶        11     (“The         court’s      chief       goal      in
    interpreting         a    statute         is    ‘to       fulfill         the     intent        of     the
    legislature that wrote it.’                         In determining the legislature’s
    intent,      we     initially        look       to       the    language        of    the       statute
    itself.” (citations omitted)).                       Subsection B expressly refers to
    an award of fees to “any party.”                         A.R.S. § 12-348.B.               Similarly,
    subsection          E,    in   describing             the       limitations          imposed          upon
    attorney       fees,      refers     to        “awards,”            apparently       contemplating
    multiple awards.               Nothing in the statute indicates that the
    legislature intended the cap on fees to apply to each “action”
    brought to challenge the collection of taxes, rather than to
    each “party.”            We think that, if the legislature had intended to
    limit   the       statute      as    the       County       urges,        it    would     have       used
    34
    language making that limitation clear.         Bilke, 
    206 Ariz. at
    465
    ¶ 15, 
    80 P.3d at 272
    .
    ¶45         Interpreting section 12-348 as applying to each party
    rather than to a single action also furthers another important
    interest.     We encourage plaintiffs to consolidate their actions,
    and thereby further judicial economy, when we allow each party
    to recover fees even if the same attorney represents multiple
    plaintiffs.     Were we to interpret the statute as the County
    urges, we would encourage each of many plaintiffs to file a
    separate action with separate representation.          The result not
    only would reduce judicial economy but also, because several
    attorneys would perform duplicative work, actually could cause
    additional, unnecessary expense to the County.16
    ¶46         Contrary   to   the   Taxpayers’   approach,   however,   the
    statute does not envision setting the maximum recoverable fee by
    simply multiplying the number of plaintiffs represented by the
    same attorney by $30,000.00.       Instead, the fee recovered by each
    party must reflect only the effort expended on behalf of that
    party.   When the same attorney represents multiple plaintiffs,
    therefore, recovery is limited to the incremental increase in
    fees related to the representation of each additional plaintiff,
    16
    We note that the statute, by capping an attorney’s billable
    rate at $175.00 per hour, imposes another restriction that
    guards against a party receiving a windfall as attorney fees.
    A.R.S. § 12-348.E.3.
    35
    because only that incremental increase in effort reflects time
    spent on behalf of that party.           Thus, if the reasonable attorney
    fee    associated     with   establishing    the    claim       of    the    first   of
    multiple     plaintiffs      is   $50,000.00,      that    party       can    recover
    $30,000.00, but the additional portion of the fee does not “roll
    over” to the second plaintiff represented.                  Rather, that party
    must establish the additional reasonable attorney fee associated
    with the representation of the second party.                     In many actions,
    the incremental increase will be relatively small; in others,
    such as actions in which establishing the damages of each party
    requires complex calculations, the incremental increase may be
    relatively large.         In all instances, the prevailing party must
    establish the amount of reasonable attorney fees.
    ¶47          The clear language of A.R.S. § 12-348 permits each
    party to receive an award of attorney fees up to $30,000.00 for
    each    level    of   appeal.      Therefore,      the    tax    court       erred   in
    construing      section   12-348   as   permitting        only    a   single    award
    regardless of the number of individual plaintiffs involved in an
    action, and we reverse the court’s judgment limiting the fees
    award.     Consistent with this opinion, the tax court, on remand,
    must determine the appropriate amount of the attorney fee award
    36
    due the Taxpayers as prevailing parties under the test set out
    above.17
    ¶48         The final issue we address involves the tax court’s
    finding that $4,000.00 was “a reasonable sum for Mr. Abrams’
    expert witness expenses.”          See A.R.S. § 12-348.B (permitting a
    prevailing party to recover the reasonable expenses of expert
    witnesses).       The   County   argues      that    the   tax   court   erred    in
    finding    that   Mr.   Abrams    qualified     as    an   expert    and   was    of
    assistance to the tax court.18          We find no clear error in the tax
    court’s findings.
    ¶49         Mr. Abrams offered testimony explaining the County’s
    tax roll data.      The tax court found that Mr. Abrams’ testimony
    “assisted   the    trier   of    fact   to    understand     the    evidence     and
    determine facts in issue.”         Because the tax court was the trier
    of fact, that court could determine better than we whether Mr.
    Abrams was of assistance.         Accordingly, we conclude that the tax
    court did not abuse its discretion in awarding reasonable expert
    witness fees.
    17
    The Taxpayers also request this court to award them
    reasonable attorney fees incurred before this court pursuant to
    A.R.S. § 12-348.B.     We conclude that the Taxpayers, as the
    prevailing parties, are entitled to an award of reasonable
    attorney fees incurred in this proceeding. See ARCAP 21.
    18
    Arizona Rule of Evidence 702 allows “a witness qualified as
    an expert by knowledge, skill, experience, training, or
    education” to testify in order to “assist the trier of fact to
    37
    IV.
    ¶50       For   the   foregoing   reasons,   we   vacate   the   court   of
    appeals’ memorandum decision, affirm in part and reverse in part
    the judgment of the tax court, and remand to the tax court to
    determine the appropriate amount of refund and attorney fees.
    ____________________________________
    Ruth V. McGregor, Vice Chief Justice
    CONCURRING:
    __________________________________
    Charles E. Jones, Chief Justice
    __________________________________
    Rebecca White Berch, Justice
    __________________________________
    Michael D. Ryan, Justice
    __________________________________
    Andrew D. Hurwitz, Justice
    __________________
    understand the evidence or to determine a fact in issue.”           Ariz.
    R. Evid. 702.
    38