Aeon Financial, LLC v. District of Columbia , 84 A.3d 522 ( 2014 )


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    DISTRICT OF COLUMBIA COURT OF APPEALS
    Nos. 12-CV-695, 12-CV-696, 12-CV-1013,
    12-CV-1241, 12-CV-1278, & 12-CV-1348
    AEON FINANCIAL, LLC, APPELLANT/CROSS-APPELLEE,
    V.
    DISTRICT OF COLUMBIA, APPELLEE/CROSS-APPELLANT.
    Appeals from the Superior Court
    of the District of Columbia
    (CA-1472-09, CA-1487-09, & CA-3938-10)
    (Hon. Joseph E. Beshouri, Magistrate Judge)
    (Hon. Melvin R. Wright, Reviewing Judge)
    (Argued January 31, 2013                              Decided February 6, 2014)
    Malik J. Tuma for appellant/cross-appellee.
    James C. McKay, Jr., Senior Assistant Attorney General, with whom Irvin
    B. Nathan, Attorney General for the District of Columbia, Todd S. Kim, Solicitor
    General, and Donna M. Murasky, Deputy Solicitor General, were on the brief, for
    appellee/cross-appellant.
    Vanessa A. Buchko filed a brief on behalf of Legal Counsel for the Elderly
    as amicus curiae in support of appellee.
    Before BLACKBURNE-RIGSBY and MCLEESE, Associate Judges, and
    STEADMAN, Senior Judge.
    2
    MCLEESE, Associate Judge: If an owner of real property in the District of
    Columbia fails to pay property taxes, the District may sell the property, in order to
    satisfy the unpaid tax obligation. In some cases, the purchaser at the tax sale
    ultimately obtains title to the property. In other cases, the delinquent property
    owner redeems the property, by paying delinquent taxes, interest, and certain
    expenses incurred by the tax-sale purchaser. The interest owed by the delinquent
    taxpayer continues to accrue until the date of redemption, at a rate of 1.5% per
    month. If a property is redeemed, the District thereafter must make a refund in the
    appropriate amount to the tax-sale purchaser.
    In these cases, Aeon Financial LLC purchased the properties at issue at tax
    sales. The delinquent tax sale purchasers subsequently made payments in order to
    redeem the properties, and the District determined that each of the properties had
    in fact been redeemed as of particular dates. Aeon contended, however, that the
    delinquent property owners had not made payments in the amount necessary to
    redeem the properties, and that the properties therefore had not yet been redeemed.
    Thus, according to Aeon, delinquent taxpayers would have to pay additional
    amounts of interest in order to redeem the properties, which in turn would increase
    the amount of the refund to which Aeon would be entitled if the properties
    ultimately were properly redeemed.
    3
    Aeon appeals from several trial-court orders that (a) concluded that the
    properties at issue had been properly redeemed by the delinquent property owners
    and (b) calculated the amounts of the redemption refunds due to Aeon. Aeon
    reiterates its position that the properties have not yet been properly redeemed and
    that the trial court thus incorrectly calculated the refund amounts. The District
    cross-appeals, arguing that the Superior Court erred in ordering the District to pay
    refunds to Aeon before Aeon dismissed its actions to foreclose redemption.
    We first address a number of threshold issues, including whether we have
    jurisdiction over the appeals. On the merits, we ultimately conclude that a property
    is redeemed when, at the same time: (a) the District concludes in good faith,
    whether correctly or incorrectly, that all amounts levied by it have been paid; and
    (b) the tax-sale purchasers’ reimbursable expenses have been paid. Because it is
    not clear that the trial court utilized this approach in determining the dates of
    redemption and refund amounts in these cases, we remand for further proceedings.
    In the cross-appeals, we hold that the District is not required to pay Aeon refunds
    until Aeon dismisses its actions to foreclose redemption.
    4
    I.
    A.
    Before addressing the parties’ claims, we describe the pertinent statutes and
    regulations governing tax sales in the District of Columbia.
    When an owner of real property in the District is delinquent in making
    property-tax payments, the District may sell the property at a public auction called
    a tax sale. D.C. Code § 47-1330 et seq. (2012 Repl.). Properties offered at a tax
    sale are generally sold for no less than the amount of unpaid taxes due (including
    penalties, interest, and costs), and bidders may add “surplus” amounts to their bid
    to purchase a property. D.C. Code §§ 47-1346 (c), -1330. Upon full payment of
    the bid amount, the District issues a certificate of sale to the tax-sale purchaser,
    documenting the sale of the property. D.C. Code §§ 47-1347, -1348.
    The delinquent property owner may seek to redeem the property at any time
    until the right of redemption is foreclosed. D.C. Code § 47-1360. In order to
    redeem a property, the delinquent property owner must pay certain amounts,
    including the amount paid by the tax-sale purchaser at the tax sale (exclusive of
    5
    any surplus), subsequent taxes due, interest, and certain expenses of the tax-sale
    purchaser.     D.C. Code §§ 47-1361 (a), -1377.           See also D.C. Code
    §§ 47-1334, -1348 (b). The delinquent property owner generally must make that
    payment to the District, although certain expenses may be paid directly to the
    tax-sale purchaser if the tax-sale purchaser provides a release acknowledging
    payment of the expenses owed. D.C. Code § 47-1361 (a)(6). After the amounts
    specified by D.C. Code § 47-1361 (a) have been paid, the District notifies the
    tax-sale purchaser that the property has been redeemed. D.C. Code § 47-1361 (d).
    Once the District gives this notice, the tax-sale purchaser “shall surrender the
    certificate of sale and shall receive from [the District] the amount to which the
    [tax-sale] purchaser is entitled.” 
    Id. If a
    delinquent property owner has not redeemed the property within six
    months of the tax sale, the tax-sale purchaser may file an action seeking to
    foreclose the right of redemption. D.C. Code § 47-1370 (a). The delinquent
    property owner can redeem the property while such an action is pending. D.C.
    Code § 47-1370 (d). If a dispute arises about the proper redemption amount, the
    Superior Court can determine the proper amount. D.C. Code § 47-1362 (a). Once
    a dispute regarding redemption arises, the District may not accept a redemption
    payment unless the Superior Court issues an order setting a redemption amount
    6
    and that order is filed with the Mayor. D.C. Code § 47-1362 (c); see also 9 DCMR
    § 316.5 (f) (2013).
    When finally resolving a suit to foreclose the right of redemption, the trial
    court may (1) bar the right of redemption; (2) vest title in fee simple in the tax-sale
    purchaser; or (3) set aside the sale and determine the redemption amount. D.C.
    Code § 47-1370 (b). In the absence of fraud by the tax-sale purchaser, the trial
    court may set aside a tax sale only if the property is redeemed. D.C. Code
    § 47-1380 (b). If the court sets aside the sale on grounds other than fraud by the
    tax-sale purchaser, the District is required to pay the tax-sale purchaser the
    redemption amount. D.C. Code § 47-1380 (a), (c). The District has the authority
    to cancel a tax sale, but if it exercises that authority, it must pay the tax-sale
    purchaser the redemption amount. D.C. Code § 47-1366.
    Because the redemption amount includes interest, the redemption amount
    will necessarily depend on the date of redemption. See D.C. Code § 47-1361 (a);
    9 DCMR § 316.6 (d) (statutory interest runs until date of redemption). The D.C.
    Code does not specifically define the date of redemption, although as previously
    indicated, it does list certain payments as prerequisites to redemption. See, e.g.,
    D.C. Code § 47-1361 (a), (d). The regulations define the date of redemption as the
    7
    “earlier of the date payment of all taxes, assessments, penalties, interest, fees and
    costs has been posted to the applicable billing system, or the date owner provides
    [the Office of Tax and Revenue] with copies of the certified check and paid bank,
    or applicable agency, receipts confirming payment in full of all taxes, assessments,
    fees and costs.” 9 DCMR § 316.12 (g). The regulations further provide that, once
    an action to foreclose redemption has been filed, a property will qualify for
    redemption only if the delinquent property owner “pay[s] in full . . . [a]ll taxes,
    assessments, fees, costs and expenses levied by a Taxing Agency,” as well as
    certain other expenses of the tax-sale purchaser. 9 DCMR § 316.5 (a). In addition,
    if a dispute about the redemption amount arises after an action to foreclose
    redemption has been filed, the “property shall not be redeemed until the amount
    appearing on an order of the court is satisfied in full.” 9 DCMR § 316.5 (f).
    If a delinquent property owner redeems the property, the District is required
    to notify the tax-sale purchaser. D.C. Code § 47-1361 (d). The tax-sale purchaser
    must surrender the certificate of sale, and the District then must pay the tax-sale
    purchaser the “amount to which the purchaser is entitled.” 
    Id. This required
    payment is called a redemption refund, and its amount is specified by statute and
    regulation.   D.C. Code § 47-1380 (c); 9 DCMR §§ 316.3, 316.6 (c).               The
    redemption refund includes the amount paid at the tax sale, including any surplus;
    8
    interest on the amount of the tax delinquency; and certain other expenses of the
    tax-sale purchaser. 
    Id. The interest
    on the delinquent taxes accrues at the rate of
    1.5% per month and continues to accrue until the date of redemption but not
    thereafter. 9 DCMR § 316.6 (c), (d). If a tax-sale purchaser seeks a redemption
    refund after filing an action to foreclose redemption, the tax-sale purchaser must
    provide the District with a copy of the “praecipe that dismisses the foreclosure
    action and/or [a] copy of the Certificate of Cancellation that cancels the Certificate
    of Sale.” 9 DCMR § 316.6 (a)(2). This requirement is a “prerequisite[]” for
    collecting a redemption refund. 9 DCMR § 316.6.
    B.
    In 2008 and 2009, Aeon purchased the “Broadwater,” “Wasef,” and
    “Culbertson” properties, in addition to hundreds of other properties, at the
    District’s real-property tax sales. After the expiration of the required six-month
    waiting period, Aeon filed complaints to foreclose the right of redemption for
    many of the unredeemed properties, including the Broadwater, Wasef, and
    Culbertson properties. In many of the cases, Aeon and the District disputed both
    whether the properties had been redeemed and how to calculate the redemption
    refunds.
    9
    The Superior Court organized the cases into several groups, each with a
    representative “lead” case. Aeon Financial v. Broadwater (CA-1487-09) was the
    lead case for a group of 20 cases, Aeon Financial v. Wasef (CA-1472-09) was the
    lead case for a group of 134 cases, and Aeon Financial v. Culbertson
    (CA-3938-10) was the lead case for a group of 35 cases. All of the cases were
    assigned to a magistrate judge.
    While Broadwater, Wasef, and Culbertson were pending, the Superior Court
    resolved several general questions critical to the determination of redemption dates
    and the calculation of redemption refunds, in Aeon Financial v. Haynes, et al.
    (CA-1920-10).    A magistrate judge made the initial ruling in Haynes, and a
    reviewing Superior Court judge later affirmed that ruling. See generally D.C.
    Code § 11-1732 (k) (2012 Repl.) (providing that certain magistrate-judge orders
    are subject to review by Superior Court judge). The reviewing court in Haynes
    concluded that the District had been committing three errors in determining the
    amount of interest for purposes of calculating redemption amounts. First, the
    District should have been charging delinquent property owners interest for the
    month in which the tax sale occurred. Second, the District should have been
    calculating interest each month based on the tax-sale purchase price (less any
    10
    surplus), not on the amount of unpaid tax in a given month. Third, the District
    should have been treating interest as continuing to accrue until all payments
    essential to redemption had been made, whereas the District had been stopping the
    accrual of interest before certain expenses were paid.1
    The reviewing court then addressed the implications of these errors for
    whether, and if so when, the District should have treated the properties as
    redeemed. On that point, the reviewing court concluded that Aeon could not “undo
    redemption” based on errors that the District made in calculating and collecting
    taxes. Moreover, although Aeon was entitled to a refund in the proper amount, the
    reviewing court concluded that the District could permissibly make a refund
    payment that was greater than the redemption payment that the delinquent property
    owner made.
    The reviewing court also stated a test for determining the date of
    redemption: a property is redeemed on the date that (a) taxes, as assessed by the
    District, reached a zero balance; and (b) all other payments required for redemption
    1
    We do not understand the District to dispute for purposes of these appeals
    that its procedures for assessing interest were erroneous in the three respects
    identified by the reviewing court. We therefore see no need for further discussion
    of the reviewing court’s rather complex analysis of those issues.
    11
    have been made. Finally, the reviewing court directed the magistrate judge to
    determine the proper refund amount on a case-by-case basis.
    The magistrate judge subsequently applied the framework adopted in
    Haynes to the Broadwater, Wasef, and Culbertson properties, setting dates of
    redemption and calculating the refunds due to Aeon. In each case, the magistrate
    judge: (1) ordered the District to pay Aeon the refund within thirty days; (2)
    ordered Aeon to file a praecipe with the court acknowledging receipt of this
    payment; and (3) stated that the court would dismiss the foreclosure action when
    Aeon filed this praecipe. Both parties sought review in the Superior Court.
    The District challenged the requirement that it pay refunds to Aeon before
    Aeon dismissed its actions to foreclose redemption, and Aeon challenged the
    determination that the properties had been redeemed (thus terminating the accrual
    of additional interest in Aeon’s favor) and the resulting calculation of the amounts
    to be refunded to Aeon. The reviewing court affirmed the magistrate judge’s
    orders in each case, except that the reviewing court dismissed as untimely Aeon’s
    motion for review in Wasef.       These consolidated appeals and cross-appeals
    followed.
    12
    II.
    We begin by addressing five threshold issues. First, we conclude that we
    have jurisdiction over the appeals. Second, we affirm the reviewing court’s order
    dismissing as untimely Aeon’s motion for review in Wasef. Third, we hold that
    Aeon has standing to raise all but one of its arguments. Fourth, we hold that the
    doctrine of caveat emptor does not preclude Aeon from asserting its rights to
    obtain a refund in the amount required by statute. Fifth, we decide that the
    resolution of these cases will not draw into question the title of the delinquent
    property owners to the properties at issue and will not impose additional monetary
    liabilities on the delinquent property owners.
    A.
    We turn first to the question whether we have jurisdiction over these
    appeals. The orders at issue present a question of finality because they did not
    terminate the proceedings in the trial court. Rather, the orders provide that the
    cases would be dismissed only after the parties each took an action: the District
    was to pay Aeon the specified refund within thirty days, after which Aeon was
    required to file a praecipe with the court acknowledging receipt of that payment.
    13
    The District refused to make the ordered payments by the specified date, instead
    taking the position that it could not be required to make such payments until Aeon
    dismissed its actions to foreclose redemption. This court subsequently stayed the
    order requiring that the District pay refunds by a date certain. The trial court
    therefore did not dismiss the cases, which are still pending.
    The parties agree that the orders are final and appealable. We nevertheless
    must ensure that we have jurisdiction. See Murphy v. McCloud, 
    650 A.2d 202
    , 203
    n.4 (D.C. 1994). We conclude that the orders in this case are properly viewed as
    final and appealable. 2
    Generally, an order is final “when it terminates the litigation between the
    parties on the merits of the case, and leaves nothing to be done but to enforce by
    execution what has been determined.” District of Columbia v. Tschudin, 
    390 A.2d 986
    , 988 (D.C. 1978) (quoting St. Louis Iron Mountain & S. Ry. v. Southern
    Express, 
    108 U.S. 24
    , 28-29 (1883)). “[I]f nothing more than a ministerial act
    2
    Because we conclude that the orders at issue are final, we need not
    consider whether they would in any event be appealable either as orders granting
    an injunction or as orders affecting the possession of property. D.C. Code
    § 11-721 (a)(2)(A), (C) (2012 Repl.).
    14
    remains to be done, . . . the decree is regarded as concluding the case and is
    immediately reviewable.” 
    Id. (internal quotation
    marks omitted). The orders at
    issue in this case fully determined the legal rights and obligations of the parties,
    leaving to be done only ministerial acts relating to the execution of the orders.
    Although the parties did not complete those acts, at least in part because this court
    entered a stay, we nevertheless view the orders as final and appealable. Cf., e.g.,
    Giove v. Stanko, 
    977 F.2d 413
    , 415 (8th Cir. 1992) (treating as final and appealable
    order setting aside conveyance of property but retaining jurisdiction to permit
    plaintiff to proceed against property through writ of execution); Taper v. City of
    Long Beach, 
    181 Cal. Rptr. 169
    , 177-78 (Ct. App. 1982) (treating as final and
    appealable order dismissing action upon payment of sums due pursuant to separate
    judgment).
    B.
    Second, we address an issue specific to Wasef. The magistrate judge entered
    an initial order setting a refund amount in Wasef on March 2, 2012. On April 24,
    2012, Aeon filed a motion for review of that order in the Superior Court. The
    reviewing court denied that motion as untimely. In its initial brief in this court,
    Aeon did not address the reviewing court’s timeliness ruling. The District argued
    15
    in response that Aeon had abandoned any challenge in this court to the reviewing
    court’s timeliness ruling, by failing to address that issue in its opening brief. In
    reply, Aeon argued that this court should overlook its failure to address the
    timeliness issue in its opening brief, that its motion for review was timely, and that
    the correctness of the underlying refund order is properly before this court even if
    the motion for review was untimely. We conclude that Aeon failed to properly
    preserve a challenge to the reviewing court’s dismissal of Aeon’s motion for
    review as untimely. We therefore affirm the reviewing court’s dismissal of Aeon’s
    challenge to the refund order in Wasef.
    “[I]t is the longstanding policy of this court not to consider arguments raised
    for the first time in a reply brief.” Marshall v. United States, 
    15 A.3d 699
    , 711 n.2
    (D.C. 2011) (internal quotation marks omitted). For three principal reasons, we
    adhere to that policy in this case. First, Aeon does not identify a specific reason
    for this court to deviate from that policy.      Second, the arguments that Aeon
    belatedly attempts to raise are not clearly articulated or fully developed. Third,
    some of Aeon’s arguments do not appear persuasive at first blush and others would
    require the court to delve into complex and seemingly difficult procedural and
    16
    jurisdictional issues.3 We therefore decline to address Aeon’s belated challenge to
    the Superior Court’s dismissal of its motion for review in Wasef.
    C.
    Third, we address the District’s claim that Aeon lacks prudential standing to
    raise the arguments it advances on appeal. This court has “generally . . . applied
    prudential limitations on the exercise of [its] jurisdiction.” Grayson v. AT&T
    Corp., 
    15 A.3d 219
    , 233-34 (D.C. 2011) (en banc). Under prudential standing
    requirements, a plaintiff “may not attempt to litigate generalized grievances, and
    may assert only interests that fall within the zone of interests to be protected or
    regulated by the statute or constitutional guarantee in question.”     Community
    Credit Union Servs. v. Federal Express Servs. Corp., 
    534 A.2d 331
    , 333 (D.C.
    1987) (internal quotation marks omitted). In addition, a plaintiff must generally
    3
    For example, Aeon suggests that the time within which it was required to
    seek review in the Superior Court began to run not on March 2, 2012, the date the
    magistrate judge entered a single order setting refund amounts in a number of cases
    including Wasef, but rather on April 19, 2012, when the magistrate judge entered a
    separate order in Wasef alone, specifying the same refund amount, “for the
    convenience of the District of Columbia in processing a refund to [Aeon].” Aeon
    also appears to suggest in a footnote that any failure on its part to seek timely
    Superior Court review in Wasef is not an impediment to a ruling by this court on
    the merits in Wasef. But Aeon’s reasoning in support of that suggestion is unclear.
    See generally Gorbey v. United States, 
    54 A.3d 668
    , 699 n.52 (D.C. 2012)
    (declining to consider argument “outlined, but not developed,” in footnote).
    17
    “assert only its own legal rights.” 
    Id. Aeon claims
    that the trial court erred in three interrelated respects: in ruling
    that the properties at issue had been redeemed, in determining the date on which
    the properties had been redeemed, and in calculating redemption amounts. We
    conclude that Aeon has prudential standing to make all but one of its arguments.
    Aeon’s challenge to the proper interpretation of the tax-sale statutes and
    regulations is not a generalized grievance, but rather reflects a claim that is specific
    to tax-sale purchasers involved in the redemption process. See generally, e.g.,
    Padou v. District of Columbia Alcoholic Beverage Control Bd., 
    70 A.3d 208
    , 212
    (D.C. 2013) (“Alleged harms shared in substantially equal measure by all or a large
    class of citizens are called generalized grievances and do not warrant exercise of
    jurisdiction.”) (internal quotation marks omitted).         We reach the opposite
    conclusion, however, with respect to Aeon’s claim that it would be unlawful under
    D.C. Code § 47-104 (2012 Repl.) or other general principles of law for the District
    to use tax proceeds or other public funds to make payments on behalf of delinquent
    18
    property owners.4    Such complaints about the legality of public expenditures,
    which could equally be brought by any taxpayer, are prototypical generalized
    grievances. See, e.g., Lujan v. Defenders of Wildlife, 
    504 U.S. 555
    , 573-75 (1992).
    We therefore do not address Aeon’s general challenge to the legality of the
    District’s use of public funds to make refund payments that exceed the redemption
    payments made by delinquent property owners.5
    Aeon’s remaining claims are “arguably within the zone of interests to be
    protected or regulated by the statute . . . in question.” Lee v. District of Columbia
    Bd. of Appeals & Review, 
    423 A.2d 210
    , 216 (D.C. 1980). The provisions of the
    tax-sale statutes and regulations that Aeon relies upon are directed at determining
    4
    Section 47-104 provides:
    It shall not be lawful for the District authorities, or any person
    charged with the disbursements of money in the District, to divert
    from its legitimate object any money levied or collected as taxes from
    the people of the District. Any person who shall violate the
    provisions of this section shall be deemed guilty of a misdemeanor in
    office, and shall be dismissed therefore.
    5
    We note, however, that the District is expressly authorized not only to
    make redemption-refund payments to tax-sale purchasers, D.C. Code
    § 47-1361 (d), but also to use public funds to protect the interests of delinquent
    property owners in the redemption process, D.C. Code § 47-1366 (District may
    cancel tax sale, to prevent injustice to delinquent property owner, but must pay
    redemption amount to tax-sale purchaser).
    19
    whether a property has been redeemed and, if so, when it was redeemed. Those
    provisions directly implicate Aeon’s rights and interests, because they determine
    (a) whether Aeon still has an interest in properties that it purchased at tax sales and
    (b) what the amount of Aeon’s redemption refunds should be.                This close
    connection between Aeon’s interests and the provisions that it relies upon is more
    than sufficient to meet the zone-of-interest requirement. See generally, e.g., D.C.
    Library Renaissance Project/West End Library Advisory Grp. v. District of
    Columbia Zoning Comm’n, 
    73 A.3d 107
    , 115 (D.C. 2013) (“The zone-of-interests
    requirement is not especially demanding, . . . . [T]he benefit of any doubt goes to
    the plaintiff.”) (internal quotation marks and citations omitted).
    Finally, Aeon is asserting its own rights: to retain its interest in properties
    unless they have properly been redeemed and to collect a refund that is properly
    calculated. We therefore hold that, with the one exception previously noted, Aeon
    has standing to raise its claims.
    D.
    Fourth, the District argues that the doctrine of caveat emptor bars Aeon from
    challenging redemption based on errors in the District’s tax-assessment and
    20
    tax-collection practices. We disagree.
    Under the doctrine of caveat emptor, a tax-sale purchaser “assumes the risks
    involved” with purchasing a tax-sale property, and has “no remedy against the
    taxing authorities” beyond the remedies provided by the tax-sale statutes.
    McCulloch v. District of Columbia, 
    685 A.2d 399
    , 402 (D.C. 1996) (internal
    quotation marks omitted). That doctrine poses no obstacle to Aeon’s claims. Aeon
    raises two main issues: whether the properties in these cases have been redeemed
    and if so on what date redemption occurred. The resolution of those issues, in turn,
    directly affects the amount of the refunds owed to Aeon because those refund
    amounts include interest through the date of redemption but not thereafter. D.C.
    Code §§ 47-1361 (d), -1380 (c)(1); 9 DCMR § 316.6 (d). Thus, the arguments
    Aeon raises go directly to a specific entitlement under the tax-sale statutes:
    payment of a redemption refund in the correct amount. We therefore conclude that
    Aeon’s arguments are not barred by the doctrine of caveat emptor. Cf. Rupsha
    2007, LLC v. Kellum, 
    32 A.3d 402
    , 411 n.16 (D.C. 2011) (doctrine of caveat
    emptor did not bar tax-sale purchaser’s claim that District was required to cancel
    tax sale of property that had been sold in error, and to reimburse tax-sale purchaser
    accordingly; tax purchaser was “seeking what it is entitled to under the [tax-sale]
    21
    statute”).6
    E.
    Fifth, we address a question that helps to determine the scope of our inquiry:
    whether the current dispute involves only the interests of Aeon and the District, or
    whether instead the interests of the delinquent property owners remain at issue.
    We conclude that the interests of the delinquent property owners are no longer at
    issue in these cases.
    Aeon originally named the delinquent property owners as defendants in the
    actions to foreclose redemption, but the reviewing court subsequently granted
    Aeon’s unopposed motion to dismiss the delinquent property owners from the
    actions. In its prayer for relief on appeal, Aeon asks this court to reverse and
    remand, for the tax sales to be cancelled or set aside, and for the District to pay
    6
    More generally, the caveat-emptor cases cited by the District were decided
    under an older version of the tax-sale statutes. 
    Rupsha, 32 A.3d at 411
    n.16. We
    stated in Rupsha that “[t]he current statutory provisions preclude applying the
    common law rule of caveat emptor.” 
    Id. See also
    D.C. Code § 47-1384
    (“Notwithstanding any other law, the provisions of this chapter shall be liberally
    construed as remedial legislation to encourage the foreclosure of the right of
    redemption by suits in Superior Court and for the decreeing of marketable titles to
    real property sold by the Mayor.”).
    22
    Aeon “all amounts due for redemption through the date of cancellation.” For its
    part, the District acknowledges that if the judgments are reversed, the issue on
    remand will involve a determination of the amount of additional interest owed to
    Aeon, which the District must pay. We thus treat the parties as having agreed that
    further proceedings in this case will not imperil the delinquent property owners’
    title to the underlying properties or impose further financial burdens on the
    delinquent property owners. We view the parties’ agreement as appropriate in the
    circumstances of this case. See D.C. Code § 47-1371 (b)(3) (if plaintiff in action to
    foreclose right of redemption does not name property owner, rights of property
    owner “shall not be affected by the action”); cf. 
    Rupsha, 32 A.3d at 411
    -13 (where
    District’s administrative error caused property to be sold at tax sale in error,
    District was required to cancel tax sale and make appropriate payment to tax-sale
    purchaser, to prevent injustice). In particular, we give weight to the substantial
    authority supporting the principle that, in the absence of bad faith, an error by the
    taxing authority does not prevent the redemption of property. See generally, e.g.,
    C.S. Petrinelis, Annotation, Effect of Certificate, Statement (or Refusal Thereof),
    or Error by Tax Collector or Other Public Officer Regarding Unpaid Taxes or
    Assessments Against Specific Property, 
    21 A.L.R. 2d 1273
    , 1280 (1952) (noting
    “almost universal rule” that “the good faith effort of a property owner to pay taxes,
    frustrated by . . . error . . . of the public officer required to accept payment and give
    23
    information as to the status of delinquent taxes[] is equivalent to payment, at least
    to the extent that it will discharge tax liens subsequently declared against the land[]
    and effectually bar sales for nonpayment of taxes”) (citing cases); 85 C.J.S.
    Taxation § 1460, at 392 (2010) (“A redemptioner, who in good faith does all that is
    required by a public officer, is entitled in equity to the full benefit of a redemption
    even if the taxing authority made a mistake informing the redemptioner of the
    requirements.”); 16 Eugene McQuillin, Municipal Corporations § 44-218, at 957
    (3d rev. ed. 2013) (“In some circumstances, the right of redemption is not defeated
    where there has been a bona fide attempt to redeem which is defective through
    mistake of the tax officers.”).7
    III.
    We now turn to the merits of Aeon’s appeals. Aeon argues that under the
    7
    At one point in its opening brief, Aeon states in passing that “all parties to
    the foreclosure cases . . . should be reinstated as defendants and Aeon permitted to
    seek foreclosure on the properties.” That statement is inconsistent with Aeon’s
    prayer for relief, which seeks only cancellation or set aside of the tax sales. Nor
    does Aeon attempt to explain why reinstatement of previously dismissed parties
    would be appropriate even though Aeon moved to dismiss those parties and did not
    subsequently move to reinstate them during the extensive proceedings in the trial
    court. We therefore conclude that reinstatement of the previously dismissed
    parties would not be appropriate. Cf., e.g., Northeast Drilling, Inc. v. Inner Space
    Servs., Inc., 
    243 F.3d 25
    , 36-37 (1st Cir. 2001) (upholding trial court’s denial of
    belated motion to add party).
    24
    tax-sale statutes and regulations a property is not redeemed unless the
    delinquent-property owner itself makes the payment required to redeem the
    property, in an amount that is correct at the time of payment, and that the District
    cannot waive that requirement. Aeon further contends that the required payments
    have not yet been made, the properties at issue have not yet redeemed, and
    statutory interest is still accruing. For its part, the District argues that it can waive
    interest and penalties owed by delinquent property owners; that the properties at
    issue were properly redeemed; and that the trial court ordered redemption refunds
    to Aeon in the proper amounts. We hold that remand is necessary to determine the
    proper dates of redemption.
    A.
    “The proper construction of a statute raises a question of law.” Washington
    v. District of Columbia Dep’t of Pub. Works, 
    954 A.2d 945
    , 948 (D.C. 2008).
    Although this court generally resolves legal questions de novo, see Providence
    Hosp. v. District of Columbia Dep’t of Emp’t Servs., 
    855 A.2d 1108
    , 1111 (D.C.
    2004), the court ordinarily accords deference to an agency’s interpretation of a
    statute that the agency administers, unless the interpretation is “unreasonable or is
    inconsistent with the statutory language or purpose.” District of Columbia Dep’t of
    25
    Env’t v. East Capitol Exxon, 
    64 A.3d 878
    , 880-81 (D.C. 2013) (internal quotation
    marks omitted).      Moreover, this “court generally defers to an agency’s
    interpretation of its own regulations unless that interpretation is plainly erroneous
    or inconsistent with the regulations.”     District of Columbia Office of Tax &
    Revenue v. BAE Sys. Enter. Sys., 
    56 A.3d 477
    , 481 (D.C. 2012) (internal quotation
    marks omitted).
    B.
    We first address the question whether the District is permitted to waive
    interest and penalties owed by a delinquent property owner. We hold that such
    waivers are permissible.
    D.C. Code § 47-811.04 (1) (2012 Repl.) permits the District to waive
    “interest or penalties[] on unpaid taxes levied under this chapter.” “[T]his chapter”
    refers to Chapter 8 of Title 47, which deals with real-property taxes. See D.C.
    Code §§ 47-801 to -895.35 (2012 Repl.).         By its terms, § 47-811.04 seems
    applicable to the interest and penalties on the unpaid real-property taxes of
    delinquent property owners whose properties have been subject to tax sale, because
    the unpaid property taxes at issue are levied under Chapter 8 of Title 47. Aeon
    26
    argues, however, that the provision does not apply to interest that accrues after a
    tax sale has occurred, because such interest accrues under the tax-sale provisions of
    Chapter 13A of Title 47.8      We disagree with Aeon’s reading of the waiver
    provision, because that provision requires that the unpaid taxes be levied under
    Chapter 8, not that the waived interest and penalties accrue under Chapter 8.9
    Aeon also argues that the waiver provision does not permit the District to
    reduce the amounts owed by the delinquent property owners in these cases. In
    support of that argument, Aeon points out that a delinquent property owner’s
    payments must be applied in the following order: first costs; then penalties; then
    interest; and finally the original amount of unpaid taxes on the property. D.C.
    Code § 47-1331 (c). It follows, according to Aeon, that the unpaid portion of the
    delinquent property owner’s outstanding liability must consist of unpaid taxes,
    8
    As previously discussed, 
    see supra
    at pp. 4-8, Chapter 13A of Title 47
    governs the tax-sale process in the District of Columbia. The interest and penalties
    that accrue during that process are specified in D.C. Code
    §§ 47-1334, -1348 (b), -1361 (a), and -1377.
    9
    In these cases, the District has not contended that a waiver of interest
    granted after a tax sale can directly decrease the amount of the tax-sale purchaser’s
    redemption refund. We thus have no occasion to consider that issue.
    27
    rather than interest.10 Because the waiver provision does not authorize the waiver
    of taxes, Aeon concludes, the waiver provision cannot serve as a basis for reducing
    the obligations of the delinquent property owners in these cases. We are not
    persuaded by this argument. We see no reason (and Aeon has suggested no
    reason) why the District could not waive interest that has already been paid and
    then apply the prior payment to the delinquent property owner’s outstanding tax
    liability.11
    10
    This step in Aeon’s reasoning is flawed. For example, consider a case in
    which a delinquent property owner had paid all of the taxes, interest, and penalties
    owed to the District in connection with a tax sale, but had not yet paid the tax-sale
    purchaser the expenses required under D.C. Code § 47-1377. During the interval
    before payment of the expenses, additional interest would accrue. D.C Code
    § 47-1361 (a)(6); 9 DCMR § 316.6 (d) (interest runs until date of redemption). In
    such a case, the unpaid portion of the delinquent property owner’s liability would
    not consist of unpaid taxes.
    11
    In its brief on appeal, Aeon argues that the tax-sale statute requires that
    only the delinquent property owner or “other person who has an interest in the real
    property” may make payments to redeem a property. D.C. Code § 47-1360. At
    oral argument, Aeon appeared to retreat from that argument, at least to some
    degree, by conceding that third parties could make payments towards redemption
    on behalf of delinquent property owners. In any event, the reviewing court and the
    magistrate judge did not analyze these cases as involving payments by the District
    on behalf of delinquent property owners, and the District did not rely on such a
    theory in its briefs in this court. We therefore need not and do not address the
    question whether the District can cause properties to redeem by making payments
    to itself on behalf of delinquent property owners. See generally, e.g., 16 Eugene
    McQuillin, Municipal Corporations § 44-214, at 944-46 (3d rev. ed. 2013)
    (discussing question of who may make redemption payments).
    28
    Aeon also suggests that waiver of interest and penalties is impermissible
    because the tax-sale statute provides only one solution if the District mistakenly
    treats a property as redeemed: cancellation of the tax sale under D.C. Code
    § 47-1366, with appropriate compensation to the tax-sale purchaser as required
    under that provision.    We disagree.    Although cancellation of the tax sale is
    certainly one option open to the District in such circumstances, nothing in the
    tax-sale statutes suggests that the option of cancellation is intended to be the sole
    remedy, to the exclusion of options authorized by other provisions of law. Cf.
    Fawncrest Assocs., Inc. v. District of Columbia, 
    727 A.2d 892
    , 893-94 (D.C. 1999)
    (rejecting argument that provision under prior tax-sale statute permitting District to
    retain its lien on delinquent property was “the exclusive way by which the District
    may acquire property subject to a tax lien”).
    C.
    We now turn to the central issues in these appeals: whether and, if so, when
    the properties at issue in this case were redeemed.          Although we adopt a
    framework for resolving those issues, a remand is necessary to apply that
    framework to the cases before us.
    29
    The D.C. Code states the prerequisites for redemption:
    (a) To redeem the real property, the person redeeming
    shall pay to the [District] . . . the following: (1) . . . [T]he
    amount paid by the purchaser for the real property
    exclusive of surplus, with interest thereon; . . . (4) All
    other taxes, interest, and penalties paid by a purchaser on
    behalf of the real property, with the interest that would
    have been owing if the purchaser had not paid the
    taxes . . .; (5) All other taxes to bring the real property
    current; and (6) . . . [Unless a release is obtained from the
    tax-sale purchaser,] all [legal expenses and attorneys’
    fees] for which the purchaser is entitled to reimbursement
    under § 47-1377; . . . .
    D.C. Code § 47-1361 (a).
    The tax-sale regulations further provide that, once a tax-sale purchaser files
    an action to foreclose redemption, a property will qualify for redemption only if
    the delinquent property owner has “pa[id] in full . . . [a]ll taxes, assessments, fees,
    costs and expenses levied by a Taxing Agency,” as well as certain other expenses
    of the tax-sale purchaser. 9 DCMR § 316.5 (a).12 See also 9 DCMR § 316.12 (g)
    (defining date of redemption as “earlier of the date payment of all taxes,
    12
    Different regulations apply when no action to foreclose redemption has
    been filed. See 9 DCMR § 316.3. In each of the cases before us, redemption
    occurred after Aeon filed an action to foreclose redemption. Our holding is
    therefore limited to cases where the tax-sale purchaser files an action to foreclose
    redemption.
    30
    assessments, penalties, interest, fees and costs has been posted to the applicable
    billing system, or the date owner provides [the Office of Tax and Revenue] with
    copies of the certified check and paid bank, or applicable agency, receipts
    confirming payment in full of all taxes, assessments, fees and costs”).
    Relying on these provisions, Aeon argues that a property cannot be treated
    as redeemed until all of the required payments have been made, in the proper
    amount. According to Aeon, the reviewing court overlooked this principle, by
    treating properties as redeemed even though, because of errors by the District in
    calculating the redemption amount, the proper redemption amount had not been
    paid. Moreover, Aeon’s argument continues, because interest continues to accrue
    until the date that all required payments have been made, the reviewing court’s
    erroneous determinations of the dates of redemption led to corresponding errors in
    calculating redemption amounts and thus the refund amounts owed to Aeon. Our
    analysis differs from Aeon’s in significant respects.
    It is true that D.C. Code § 47-1361 (a) could reasonably be read to make
    payment in the correct amount a prerequisite to a proper determination that a
    property has been redeemed. That provision, however, does not explicitly address
    what should happen if the District erroneously calculates the amount due, accepts
    31
    payment from the delinquent property owner, and declares a property redeemed.
    As we have previously noted, there is substantial authority that in such
    circumstances the property is properly viewed as having been redeemed. 
    See supra
    at pp. 22-23. With respect to most of the payments a delinquent property
    owner is required to make, the regulation specifying the requirements for
    redemption is consistent with such an approach. Specifically, the regulation ties
    redemption to payment in the amount “levied by a Taxing Agency,” not to
    payment in the correct amount. 9 DCMR § 316.5 (a). The regulation defining
    “[d]ate of [r]edemption” is not quite as clear on the point, but does focus on the
    status of the District’s billing system, as opposed to whether the amount paid was
    equal to the amount that the District in fact ought to have billed under the tax-sale
    statute. 9 DCMR § 316.12 (g). In light of the deference owed to the District with
    respect to the interpretation of the pertinent statutes and regulations, these
    considerations support a conclusion that, with respect to amounts that are “levied
    by the Taxing Agency,” a property can be redeemed if the District determines,
    even in error, that such amounts have been paid in full.
    The analysis might be somewhat different, however, with respect to the
    reimbursable expenses of the tax-sale purchaser.       Those expenses, which are
    specified in D.C. Code § 47-1377 (a), can include both (a) a $300 fee relating to
    32
    expenses incurred before the filing of an action to foreclose redemption and (b) a
    variety of expenses, including reasonable attorney’s fees, incurred after the filing
    of an action to foreclose redemption. Those expenses are not levied by the District
    and need not be paid to the District. D.C. Code § 47-1361 (a)(6) (delinquent
    taxpayer can pay these expenses either directly to tax-sale purchaser or to District).
    With respect to these expenses, moreover, the regulations relating to redemption do
    not explicitly focus on the District’s understanding of the amounts due, as opposed
    to the amounts actually due. The present cases, however, do not involve errors as
    to the amount of reimbursable expenses under D.C. Code § 47-1377. We therefore
    need not decide how such errors might affect whether and if so when a property
    should be viewed as having been redeemed. Rather, for current purposes we
    assume that payment of the reimbursable expenses in the correct amount is a
    prerequisite to redemption.
    Under the foregoing analysis the properties in these cases were redeemed if
    and when (a) the District concluded, whether correctly or incorrectly, that all
    amounts levied by it had been paid; and (b) the tax-sale purchasers’ reimbursable
    expenses had been paid. We emphasize, however, that for a property to have been
    redeemed, both of these conditions must be met at the same time. For example, if
    the District erroneously concludes in March that all amounts levied with respect to
    33
    a given property have been paid, but reimbursable expenses have not been paid, the
    property has not redeemed. And if the reimbursable expenses are later paid in
    October, but the District by then is aware that amounts levied by it have not been
    paid, the property still has not redeemed in October. Rather, the property would
    redeem only if and when, at the same time, (a) the District concluded that all
    amounts levied had been paid and (b) the reimbursable expenses in fact had been
    paid.
    We also emphasize a second point that follows from the first: the power of
    the District to waive payment does not retroactively redeem property.         For
    example, consider a case in which a delinquent property owner in January pays all
    but $50 of the amount levied on a property, and the District in May decides to
    waive the remaining $50.      On a proper understanding, the property does not
    retroactively become redeemed in January. Moreover, in that scenario, statutory
    interest continues to run after January. Thus, the District’s decision in May to
    waive the remaining $50 would not by itself suffice to properly redeem the
    property because an additional payment (or waiver) would be needed to satisfy the
    34
    additional interest that accrued between January and May.13
    D.
    Although we have already addressed a number of the arguments raised by
    the parties, we have not yet addressed several arguments that, if accepted, might
    call for an analysis different from that just described. We do not find those
    arguments persuasive.
    1.
    The District at one point states that the tax-sale statutes and regulations
    should be read to permit the District to treat a property as redeemed on the date
    that monies owed to the District (taxes, interest, penalties, and fees) have been
    paid, even if the tax-sale purchaser’s reimbursable expenses have not yet been
    paid.14 We disagree.
    13
    If the District made a good-faith error in calculating the amount due in
    order to redeem the property, the property might properly be treated as having been
    redeemed despite that error. 
    See supra
    at pp. 31-32.
    14
    Although the District at one point states that a property is redeemed once
    the owner pays the District, the District also now acknowledges that the tax-sale
    purchaser is entitled to the interest that accrues during any delay between such
    payment to the District and the payment of reimbursable expenses to the tax-sale
    (continued . . .)
    35
    The plain language of D.C. Code § 47-1361 (a)(6) forecloses the District’s
    contention. That provision requires, as a condition of redemption, that the tax-sale
    purchaser’s reimbursable expenses under D.C. Code § 47-1377 have been paid.
    Thus, if those expenses have not yet been paid on a given date, the property cannot
    properly be viewed as having been redeemed on that date.15
    The tax-sale regulations largely point in the same direction.        First, for
    redemptions that occur before the filing of an action to foreclose redemption, the
    regulations explicitly state that redemption does not occur until reimbursable
    expenses have been paid. See 9 DCMR § 316.2 (a)(5) (“Redemption does not
    (. . . continued)
    purchaser. These two positions are not logically compatible, because if a property
    were redeemed on the date the District was paid, then interest would not accrue
    during the period from the date of redemption to the date the reimbursable
    expenses were paid. See D.C. Code § 47-1361 (a); 9 DCMR § 316.6 (d) (statutory
    interest runs until date of redemption). For the reasons stated in text, we conclude
    that a property is not properly viewed as redeemed until the reimbursable expenses
    have been paid. Moreover, as we have already explained, 
    see supra
    at pp. 28-34, a
    property does not necessarily redeem on the date of the payment of reimbursable
    expenses, but rather only redeems if and when, in addition, all of the interest
    accruing up to the date of redemption is either paid or waived. Like the trial court,
    see infra at pp. 40-41, the District does not appear to have taken account of this
    principle.
    15
    We leave open the question whether the situation would be different if
    there were a good-faith error by the taxing authority with respect to the payment of
    the tax-sale purchaser’s expenses. 
    See supra
    at pp. 31-32.
    36
    occur until all taxes, assessments, penalties, interest, fees, and other costs have
    been made current, and the reimbursable Pre-Complaint Legal Expenses have been
    satisfied in full.”). Second, for redemptions that occur after the filing of an action
    to foreclose redemption, the regulations do not state that redemption does not occur
    until payment of reimbursable expenses. But the regulations do make payment of
    reimbursable expenses a        prerequisite to redemption.          See 9     DCMR
    § 316.5 (a)(2), (a)(4). Third, the general definition of “Redeem” indicates that
    redeeming a property requires payment of the reimbursable expenses.               See
    9 DCMR § 316.12 (p). These regulatory provisions provide further support for the
    conclusion that a property is not redeemed until payment of the reimbursable
    expenses.16
    The District argues, however, that it would be “unreasonable” and “absurd”
    to require payment of the reimbursable expenses before the date of redemption.
    We are not persuaded by the District’s argument.
    16
    The general definition of “Date of Redemption” arguably points in the
    other direction, because it indicates that redemption occurs upon payment of
    “taxes, assessments, penalties, interest, fees and costs” or “taxes, assessments, fees
    and costs,” and makes no specific reference to reimbursable expenses. 9 DCMR
    § 316.12 (g). Because this provision is contrary to both plain statutory text and the
    language of other regulations, we cannot give it weight on this issue.
    37
    It is true that requiring payment of reimbursable expenses before the date of
    redemption adds some complexity to the redemption process.                That added
    complexity, however, does not rise anywhere near the level of an absurdity that
    would trump plain statutory and regulatory language.           Properly applied, the
    tax-sale statutes provide the District and delinquent property owners with
    numerous ways to cope with the added complexity. First, as long as the District
    makes the process clear, delinquent taxpayers will understand that a property will
    not be redeemed, and interest will continue to accrue on the full amount of the
    tax-sale purchase price (less any surplus), until the reimbursable expenses have
    been paid. Second, a delinquent property owner who wishes to avoid uncertainty
    can seek a certificate from the tax-sale purchaser indicating payment of the
    reimbursable expenses.17 See D.C. Code § 47-1361 (a)(6). Third, if a dispute
    arises about the redemption amount after an action to foreclose redemption has
    been filed, the court will resolve the matter. See D.C. Code § 47-1362 (a). Finally,
    the District has the authority to waive interest and penalties, 
    see supra
    at pp. 25-28.
    As the District acknowledges, exercise of that authority can in some
    17
    In theory, a tax-sale purchaser could inflate the amount of interest owed
    by unreasonably or in bad faith refusing to provide such a certificate to a
    delinquent taxpayer who had in fact proffered full payment of the reasonable
    reimbursable expenses. We have no occasion to address the question whether, if
    such a showing were made, the date of redemption should be measured as against
    the date on which adequate payment was proffered, rather than on the date the trial
    court resolves the dispute as to the proper amount of the reimbursable expenses.
    38
    circumstances eliminate the need to delay redemption until the District can
    collect additional interest   amounts   from   the   delinquent   property   owner.
    2.
    For its part, Aeon objects to the idea that a property can be treated as
    redeemed when, due to an error by the District, the District fails to collect the
    amount required by law as a condition precedent to redemption. According to
    Aeon, such an approach means that a property is redeemed whenever the District
    says that it is redeemed. It is an exaggeration to say that giving legal effect to
    good-faith errors is equivalent to permitting the District to arbitrarily and
    unilaterally determine whether and when a property has redeemed. Aeon has not
    argued in these appeals that either the District or the delinquent property owners
    acted in bad faith. We therefore do not address the issues that would be raised in a
    case in which it was alleged and demonstrated that either the District or the
    delinquent property owners acted in bad faith. 
    See supra
    at pp. 22-23 (citing
    authorities holding that, where delinquent property owner acted in good faith,
    property is treated as redeemed even if prerequisites to redemption were not met
    39
    due to error by taxing authority).18
    Further, Aeon’s preferred approach presents serious problems of its own.
    On Aeon’s view, any error, no matter how small, in determining or collecting the
    proper amount required for redemption of a property would prevent the property
    from being redeemed, apparently for however long it took for the error to be
    discovered and rectified. During that period, the statutory rate of interest of 1.5% a
    month would continue to accrue. D.C. Code § 47-1334. As Aeon emphasizes,
    moreover, that interest would be calculated based on the full amount of the original
    tax liability, not on the amount of tax liability that remained unpaid at any given
    time. D.C. Code § 47-1361 (a)(1). Even small errors could thus create large
    interest liabilities for delinquent property owners or the District.
    In sum, we conclude that the properties in these cases were redeemed if and
    when both of the following were true at the same time: (a) the District concluded,
    18
    Once there is a dispute regarding redemption, the District may not accept
    a payment for redemption unless the court has fixed the amount necessary for
    redemption and that order has been filed with the Mayor. D.C. Code
    § 47-1362 (c). It is unclear whether this provision was followed in these cases, but
    Aeon has not raised a claim that the provision was violated, and we therefore do
    not address that issue. We do note that this provision would seem to decrease the
    risk that properties will be redeemed by the District’s acceptance of payment in an
    incorrect amount.
    40
    whether correctly or incorrectly, that all amounts levied by it had been paid; and
    (b) the tax-sale purchasers’ reimbursable expenses had been paid.
    E.
    The trial court adopted a seemingly similar test for determining when
    properties have been redeemed, stating that redemption occurs “whenever there is
    a zero tax balance (or a credit) and all other payments required for redemption
    under [D.C. Code §] 47-1361 (a) have occurred.” The trial court held, however,
    that Aeon generally lacked the right to challenge the calculation of the date of
    redemption if that challenge rested on complaints about the District’s
    tax-assessment and tax-collection practices, such as the District’s decision to treat
    properties as redeemed before payment of the tax-sale purchasers’ expenses. As
    we have explained, however, 
    see supra
    at pp. 16-19, we conclude that Aeon does
    have standing to challenge the calculation of the redemption date, because such a
    challenge could affect the amount of the refunds to which Aeon is statutorily
    entitled. Moreover, perhaps because of its standing ruling, the trial court does not
    appear to have focused in the cases before us on the requirement that both
    conditions for redemption be met at the same time.
    41
    Based on the record currently before us, it is not clear what the proper
    redemption dates, and thus the proper redemption amounts, should be in the
    Broadwater and Culbertson cases. We therefore remand to the trial court to
    determine the applicable redemption date and redemption amount in each case.19
    IV.
    In its cross-appeals, the District argues that the Superior Court erred by
    ordering the District to pay redemption refunds before dismissal of the actions to
    foreclose redemption. We agree.
    By regulation, if an action to foreclose redemption has been filed, tax-sale
    purchasers seeking refunds must provide the District with a “[c]opy of the praecipe
    that dismisses the foreclosure action and/or [a] copy of the Certificate of
    Cancellation that cancels the Certificate of Sale.” 9 DCMR § 316.6 (a)(2). This
    requirement is identified as a “prerequisite[]” for collecting a refund, and the
    regulation further notes that submission of the required documentation is necessary
    19
    We note several other provisions that are potentially relevant to
    determining dates of redemption and redemption amounts. See D.C. Code
    § 47-1362 (a) (trial court can issue order fixing amount necessary for redemption);
    9 DCMR § 316.5 (f) (where trial court issues order fixing redemption amount,
    property is redeemed when amount appearing on order is satisfied in full).
    42
    to “begin the processing of a Redemption Refund.” 9 DCMR § 316.6 (a). Unless
    it is invalid or inapplicable, this regulation appears to condition the District’s
    obligation to pay a refund on the dismissal of the corresponding action to foreclose
    redemption.    Aeon raises two principal arguments in support of the contrary
    conclusion, but we do not find those arguments persuasive.
    A.
    First, Aeon contends that the regulation at issue does not expressly require
    dismissal of the action to foreclose redemption, but rather simply requires the
    tax-sale purchaser to file “a copy of [the praecipe] it would file” if and when it
    receives its redemption refund. As we have previously noted, however, this court
    “generally defers to an agency’s interpretation of its own regulations unless that
    interpretation is plainly erroneous or inconsistent with the regulations.” District of
    Columbia Office of Tax & 
    Revenue, 56 A.3d at 481
    (internal quotation marks
    omitted). We uphold the District’s interpretation of its regulation.
    In challenging the District’s interpretation, Aeon focuses on the use of the
    present tense in the word “dismisses.” According to Aeon, if the regulation had
    been intended to require the actual dismissal of the action to foreclose redemption,
    43
    the past tense -- “dismissed” -- would have been used. We do not agree. Under
    the Superior Court Rules of Civil Procedure, a “praecipe” of dismissal, filed with
    the consent of all parties, operates to dismiss an action without further order of the
    court. Super. Ct. Civ. R. 12-I (a), 41 (a)(1)(ii) (2013).20 It therefore is quite
    natural to refer to a “praecipe that dismisses” an action.           In contrast, Aeon’s
    proposed reading of the regulation is linguistically untenable. When an action to
    foreclose redemption is still pending, and the tax-sale purchaser has not moved to
    voluntarily dismiss that action, the party cannot reasonably be said to have filed a
    “praecipe that dismisses the foreclosure action.” That is so even if the tax-sale
    purchaser has submitted to the District an unfiled pleading that the tax-sale
    purchaser says that it would file if the District paid the refund.
    Aeon’s proposed interpretation of the regulation has another serious flaw: it
    is difficult to understand what meaningful purpose the regulation would serve if it
    20
    Aeon accurately observes that in some circumstances dismissal cannot be
    obtained by means of a praecipe. That observation might raise interesting issues in
    a case where an action to foreclose redemption had been dismissed by means other
    than a praecipe and the District relied on that fact to refuse to pay a refund. This
    case does not involve such circumstances, however. Nor does this case present the
    issues that might arise if the District refused to pay a redemption refund to a
    tax-sale purchaser who (a) had surrendered the tax-sale certificate and
    unsuccessfully sought dismissal of the action to foreclose redemption, or (b)
    sought a refund after an action to foreclose redemption resulted in a final order, no
    longer subject to review on appeal, setting aside or cancelling the tax sale pursuant
    to D.C. Code §§ 47-1366, -1380.
    44
    required only the submission of a copy of a pleading that might or might not be
    filed in court at some later time. In contrast, although one could reasonably debate
    the advantages and disadvantages of delaying the District’s obligation to pay a
    redemption refund until the underlying action to foreclose redemption has been
    resolved, the District’s reading at least gives the regulation an understandable
    function.
    Aeon suggests that the District’s interpretation is not entitled to deference
    because the District had not previously insisted that tax-sale purchasers dismiss
    their actions to foreclose redemption before the District would pay refunds. The
    District does not dispute on appeal that it has not generally been requiring
    dismissal before paying refunds, but the District does claim that enforcement of
    that requirement against Aeon in particular was justified because Aeon’s litigation
    strategy differed from the approach taken by other tax-sale purchasers. We need
    not resolve these issues, however, because we would uphold the District’s
    interpretation of its regulation even if that interpretation is not entitled to
    deference.21
    21
    Relatedly, Aeon argues that the “refund protocol” followed by the District
    in 2008 did not require dismissal before refund. The “refund protocol,” which
    appears to be a checklist contained in an e-mail from a District official to Aeon,
    does not have the force of law and does not bind the District. See, e.g.,
    (continued . . .)
    45
    B.
    Second, Aeon argues that the regulation contradicts D.C. Code
    § 47-1361 (d), which does not refer to praecipes of dismissal but rather provides
    that the tax-sale purchaser must “surrender the certificate of sale” before obtaining
    a refund. In response, the District contends that surrendering the certificate of sale
    is the practical equivalent of dismissing the action to foreclose redemption,
    because surrender of the certificate of sale precludes the tax-sale purchaser from
    going forward with an action to foreclose redemption.               See D.C. Code
    §§ 47-1370 (c)(1)(A), (c)(3) (requiring that complaint in action to foreclose
    redemption state date of issuance of certificate of sale and that certificate or copy
    thereof be attached to complaint). To the extent the regulation runs beyond the
    express terms of the statutory requirement, the District relies on its authority to
    “promulgate regulations to carry out the purposes” of the tax-sale provisions. D.C.
    (. . . continued)
    Bio-Medical Applications of D.C. v. District of Columbia Bd. of Appeals &
    Review, 
    829 A.2d 208
    , 215 (D.C. 2003). Finally, Aeon suggests in passing that it
    was “unconstitutional” for the District to single Aeon out for enforcement of the
    requirement that dismissal precede refund. Aeon’s passing reference to a possible
    constitutional argument does not suffice to present that argument for our resolution
    on appeal. See, e.g., Bardoff v. United States, 
    628 A.2d 86
    , 90 n.8 (D.C. 1993)
    (treating claim as abandoned, where appellant mentioned claim but did not provide
    supporting argument).
    46
    Code § 47-1335.
    Aeon does not suggest a plausible alternative reading of the pertinent
    provisions, and we therefore accept the District’s contention that a tax-sale
    purchaser who surrenders the certificate of sale can no longer go forward with an
    action to foreclose redemption. See Schwartz v. City of Chicago, 
    315 N.E.2d 215
    ,
    223 (Ill. App. Ct. 1974) (surrender of tax certificate would constitute abandonment
    of statutory and common-law rights as tax-sale purchaser); cf. Robinson v. Bailey,
    
    198 N.E. 217
    , 219 (Ill. 1935) (tax-sale purchaser may not both accept redemption
    refund and “still lay claim to the real estate redeemed from such judgment”); Petak
    v. City of Paterson, 
    677 A.2d 244
    , 246-49 (N.J. Super. Ct. App. Div. 1996) (city
    erred by paying redemption refund to tax-sale purchaser without requiring
    surrender of original tax-sale certificates).
    So understood, the pertinent provisions provide tax-sale purchasers in
    Aeon’s situation with a choice. If tax-sale purchasers decide to accept the trial
    court’s determination that a property has been redeemed and its calculation of the
    redemption amount, they may forego further litigation of those issues and obtain a
    refund in the amount previously determined by the court. Alternatively, if they
    believe that the property has not been redeemed or that the trial court erroneously
    47
    calculated the redemption amount, they may continue to litigate, wait for a final
    determination of those issues, and then seek a refund. Aeon argues, however, that
    it is unfair to require tax-sale purchasers to elect between their right to prompt
    payment of a refund and their right to challenge in court the determination that a
    property has been properly redeemed. We do not find that argument persuasive.
    In the absence of a plausible alternative interpretation of the provisions at
    issue, it is not clear how much weight Aeon’s claim of unfairness could bear. Cf.
    James Parreco & Son v. District of Columbia Rental Hous. Comm’n, 
    567 A.2d 43
    ,
    49-50 (D.C. 1989) (adopting interpretation of statute despite acknowledgement that
    result might not be “fairest of them all”); Jones v. State, 
    119 S.W.3d 766
    , 784
    (Tex. Crim. App. 2003) (en banc) (“Parties are often faced with difficult choices,
    but facing a tough dilemma does not create a claim . . . .”). In any event, other
    jurisdictions appear to give tax-sale purchasers the same choice. See cases cited
    supra at 46; see also, e.g., Heartwood 88, Inc. v. Montgomery Cnty., 
    846 A.2d 1096
    , 1104 (Md. Ct. Spec. App. 2004) (redemption refunds “are paid by the tax
    collector to the tax sale purchaser in exchange for the surrender of the certificate of
    sale”) (internal quotation marks omitted). We see no basis to conclude that the
    redemption process established by the Council is so unfairly one-sided that we are
    required to reject the District’s interpretation of the pertinent provisions.
    48
    In sum, Aeon does not appear to have surrendered its certificates of sale and
    did not seek dismissal of its actions to foreclose redemption.            Under the
    circumstances, the trial court erred in ordering the District to pay refunds to Aeon.
    V.
    For the foregoing reasons, we affirm the dismissal of the motions for review
    in Wasef. In Broadwater and Culbertson, we reverse and remand to the Superior
    Court for further proceedings.
    So ordered.