RPTL 497(2) Makes NYSERDA Filing Non-Precondition to Effectiveness of RPTL 487 Solar-Exemption Opt-Out Laws (and Applies Retroactively)

1. Introduction

Matter of Solar Advocate Dev., LLC v Assessor for Town of E. Bloomfield (2026 NY Slip Op 04570 [4th Dept July 24, 2026]) addresses a recurring dispute arising from New York’s solar-energy property-tax exemption scheme under RPTL 487: whether a municipality (here, the County of Ontario) validly “opted out” of the statutory exemption when it enacted an opt-out local law but allegedly failed to file a copy with NYSERDA as contemplated by RPTL 487 (8) (a).

The petitioner, Solar Advocate Development, LLC, owned real property in the Town of East Bloomfield and built a solar energy system costing approximately $3.1 million. After the County denied its application for a partial exemption under RPTL 487 (2), petitioner brought a combined RPTL article 7/CPLR article 78 proceeding. Supreme Court granted relief as to the County’s assessment roll, relying on a Third Department decision requiring filing with both the Department of Taxation and Finance and NYSERDA. The Fourth Department reversed and dismissed the petition against the County.

The central issues were:

  • Whether failure to file an opt-out local law with NYSERDA invalidates the opt-out under RPTL 487 (8) (a);
  • Whether RPTL 497 (2)—enacted after the Third Department’s interpretation—controls and applies in this case; and
  • Whether the County could rely on RPTL 497 (2) on appeal (preservation/interest-of-justice review).

2. Summary of the Opinion

The Fourth Department held that petitioner was not entitled to the RPTL 487 (2) partial exemption because the County had adopted a local law in 1997 opting out of the exemption, and under RPTL 497 (2) a failure to comply with certain statutory filing directions (such as filing with NYSERDA) does not render such an opt-out local law ineffective or invalid unless the exemption statute expressly makes filing a condition precedent to effectiveness.

The court:

  • Clarified that the matter is properly an RPTL article 7 tax certiorari proceeding rather than a CPLR article 78 proceeding;
  • Rejected the Supreme Court’s reliance on the Third Department’s filing-precondition approach;
  • Held that RPTL 497 (2) applies and mandates reversal because RPTL 487 (8) (a) does not expressly state that opt-out laws are ineffective until filed with NYSERDA; and
  • Concluded the Legislature intended RPTL 497 (2) to operate retroactively (at least to avoid making filing failures outcome-determinative), as shown by statutory notes preserving binding effect only for the parties in the earlier Third Department case.

3. Analysis

A. Precedents Cited

1) Proper procedural vehicle: RPTL article 7 vs CPLR article 78

The court relied on Matter of LAPC Lofts, LLC v City of Buffalo Dept. of Assessment & Taxation (155 AD3d 1539 [4th Dept 2017]) for the rule that, with exceptions not applicable, “the proper vehicle for challenging an allegedly wrongful denial of a partial [property tax] exemption is a tax certiorari proceeding pursuant to RPTL article 7, and not a CPLR article 78 proceeding.” This matters because it frames the dispute as one over an assessment/exemption determination reviewable through tax certiorari standards and remedies.

2) The filing-precondition interpretation rejected: Laertes

Supreme Court had relied on Matter of Laertes Solar, LLC v Assessor of the Town of Harford (182 AD3d 826 [3d Dept 2020], lv dismissed in part & denied in part 35 NY3d 1119 [2020] [hereinafter 1 Laertes]). There, the Third Department read RPTL 487 (8) (a) to require filing with both DOTF and NYSERDA for an opt-out to be effective, awarding the exemption where NYSERDA filing was missing.

The Fourth Department not only distinguished the case via the later-enacted RPTL 497 (2), but also stated that it did “not find persuasive” the Third Department’s construction “even without consideration of RPTL 497 (2),” signaling a doctrinal disagreement: filing language in RPTL 487 (8) (a) is not treated as an effectiveness condition unless the statute expressly says so.

3) Preservation and interest-of-justice review

Petitioner argued the County could not invoke RPTL 497 (2) because it had not cited it below. The Fourth Department’s treatment draws on multiple precedents:

  • Telaro v Telaro (25 NY2d 433, 439 [1969], rearg denied 26 NY2d 751 [1970]) and Sabine v State of New York (43 NY3d 1015, 1018 [2024]) (discussing preservation exceptions);
  • Sabine v State of New York (43 NY3d 1015, 1017 [2024]), Hecker v State of New York (20 NY3d 1087, 1087 [2013], rearg denied 21 NY3d 987 [2013]), and Bingham v New York City Tr. Auth. (99 NY2d 355, 359 [2003]) (confirming appellate discretion to reach issues “in the interest of justice”);
  • Edwards v Siegel, Kelleher & Kahn (26 AD3d 789, 790 [4th Dept 2006]) and Oram v Capone (206 AD2d 839, 840 [4th Dept 1994]) (supporting review where the issue is purely legal and fully briefed).

The Fourth Department effectively treated the County’s appellate argument as a refined legal basis for a preserved theme (that non-filing is not fatal), and alternatively invoked interest-of-justice review because the applicability of RPTL 497 (2) was a purely legal, fully briefed issue.

4) Retroactivity and “clarifying” legislation

On retroactivity, the court grounded its analysis in:

  • Majewski v Broadalbin-Perth Cent. School Dist. (91 NY2d 577, 583-584 [1998]) (framework distinguishing substantive changes from clarifications); and
  • Ruth v Elderwood at Amherst (209 AD3d 1281, 1284-1285 [4th Dept 2022]) (applying the clarifying-statute concept and legislative-intent signals).

The court treated RPTL 497 (2) as a clarification rather than a change: it did not alter substantive rights, but clarified that filing provisions like those in RPTL 487 (8) (a) are not effectiveness prerequisites absent express “shall not take effect until filed” language.

A key textual indicator was the legislative note that, although RPTL 497 (2) took effect immediately, the decision in Laertes “shall remain binding upon the parties thereto” (L 2021, ch 59, part W, § 10). The Fourth Department read this carve-out as affirmative evidence that the Legislature intended RPTL 497 (2) to apply broadly (including to earlier-enacted opt-outs), because a purely prospective statute would not need to preserve the earlier judgment’s binding effect.

B. Legal Reasoning

1) The statutory structure: exemption, opt-out, and filing

The court began with the core exemption: RPTL 487 (2) provides a 15-year exemption “to the extent of any increase in value” attributable to a solar energy system. It then emphasized the local-option limitation: under RPTL 487 (8) (a), a local government may opt out by local law.

Although RPTL 487 (8) (a) directs that a copy of any opt-out law “shall be filed with” DOTF and NYSERDA, the Fourth Department treated that direction as not automatically transforming filing into a condition precedent to legal effectiveness.

2) RPTL 497 (2) as the controlling “construction” rule

The opinion’s central move is the application of RPTL 497 (2), entitled “Construction of certain local option provisions in exemption statutes.” It provides that when an exemption statute requires filing with state agencies other than the Department of State, but does not expressly state the local law “shall not take effect until” filed, then failure to comply with filing “shall not render such local law or resolution ineffective or invalid.”

The Fourth Department found the condition in RPTL 497 (2) plainly satisfied because RPTL 487 (8) (a) does not expressly provide that an opt-out law is ineffective until filed with NYSERDA. As a result, even assuming the County did not file with NYSERDA, that failure could not invalidate the opt-out.

3) Retroactivity framed as “no defect to cure” + clarification + legislative signal

The petitioner argued the opt-out was enacted in 1997 and could not be “cured” by a 2021 statute. The Fourth Department answered in three steps:

  • No defect existed: even before RPTL 497 (2), validity was not contingent on NYSERDA filing;
  • RPTL 497 (2) is clarifying: it did not substantively change rights but clarified the correct construction (citing Majewski v Broadalbin-Perth Cent. School Dist. and Ruth v Elderwood at Amherst);
  • Legislative intent supports retroactive application: the statutory note preserving binding effect only for the Laertes parties implies broader retroactive reach.

4) Equity/expectations as context (not the doctrinal driver)

The court noted petitioner “had no expectation” of an exemption when it built the system (it applied only after Laertes), reinforcing the fairness of reaching the legal issue and applying RPTL 497 (2). While not essential to the statutory holding, this contextual point supports the court’s interest-of-justice decision to address the argument and its rejection of reliance interests.

C. Impact

  • Limits “missing NYSERDA filing” challenges: After this decision, within the Fourth Department, a property owner generally cannot invalidate an RPTL 487 (8) (a) opt-out merely by showing the municipality failed to file the opt-out law with NYSERDA, unless the governing statute expressly conditions effectiveness on such filing.
  • Undercuts the reasoning of Matter of Laertes Solar, LLC v Assessor of the Town of Harford: The Fourth Department squarely rejects the idea that NYSERDA filing is a condition precedent under RPTL 487 (8) (a), and treats RPTL 497 (2) as a legislative response to Laertes.
  • Strengthens statewide uniformity via a “construction statute”: RPTL 497 (2) is designed to apply across exemption statutes with local-option/filing mechanics, reducing litigation premised on technical filing omissions.
  • Retroactivity guidance: The decision illustrates how courts may infer retroactive intent from a targeted carve-out (“binding upon the parties thereto”) and characterize a statute as “clarifying,” expanding the statute’s practical effect beyond future enactments.
  • Appellate practice: The opinion exemplifies the Fourth Department’s willingness to reach a purely legal, fully briefed statutory-interpretation issue in the interest of justice, even where the specific statute was not cited below.

4. Complex Concepts Simplified

  • RPTL article 7 (tax certiorari): the specialized procedure for challenging property tax assessments and exemption determinations. The court emphasized this is the proper vehicle for disputing denial of a partial exemption.
  • CPLR article 78: a general mechanism to challenge administrative action; typically not used when the Legislature provided a specific review scheme (like RPTL article 7) for tax assessment disputes.
  • Local-option “opt-out”: the State created a general exemption (RPTL 487), but allowed local governments to choose not to offer it by passing a local law.
  • Mandatory vs directory filing requirements: some statutes make filing a condition for a law to take effect (“shall not take effect until filed”). Others instruct filing but do not tie it to effectiveness. RPTL 497 (2) says that, absent explicit conditional language, failure to file does not invalidate the local law.
  • Preservation: appellate courts usually review only issues raised in the trial court. Here, the Fourth Department treated the County’s argument as preserved in substance and, alternatively, reached it “in the interest of justice.”
  • Clarifying statute and retroactivity: when a statute is deemed to clarify existing meaning rather than change it, courts are more willing to apply it to past events—especially if the Legislature signals that intent.

5. Conclusion

Matter of Solar Advocate Dev., LLC v Assessor for Town of E. Bloomfield establishes (in the Fourth Department) a clear rule for RPTL 487 opt-outs: under RPTL 497 (2), a municipality’s failure to file an opt-out local law with NYSERDA does not invalidate the opt-out unless the exemption statute expressly makes filing a condition precedent to effectiveness. The court further treated RPTL 497 (2) as clarifying and retroactively applicable (subject to the Legislature’s carve-out for the Laertes parties), thereby foreclosing a common route to solar-exemption relief based on technical filing gaps.