HPD extended the 421-a(16)
construction deadline to 2031.
The income-restricted condo and co-op ownership track has no extension. New York law requires no seller to disclose this to a buyer before closing.
On September 19, 2026, the NYC Department of Housing Preservation and Development adopted an amendment to the rules governing RPTL §421-a(16) workbooks. The rule creates a new administrative pathway for projects that elected Option C or Option G to change their affordability option to one of five tracks already eligible for an existing five-year construction extension to June 15, 2031 (Options A, B, D, E, or F). Option G — the only affordability track in the 421-a(16) program designed for income-restricted condominiums and cooperatives — has no path to the 2031 extension that preserves the income-restricted ownership structure. Buildings that chose Option G and did not obtain a certificate of occupancy by June 15, 2026 now face a harder path to preserving the tax exemption that was part of their affordable ownership structure.
What a 421-a(16) workbook is, and why it still matters.
The 421-a program was New York State's primary incentive for new residential construction from 1971 through June 2022. Developers who began qualifying projects under the final version, 421-a(16), had to submit a "workbook" to HPD documenting which affordability option they selected. That selection determined the percentage of units subject to income restrictions, the income ceiling for restricted tenants or buyers, and the structure of the tax exemption.
Albany let 421-a(16) expire in June 2022 for new applications. Projects with an approved workbook or a timely Notice of Intent already on file with HPD remained eligible, but only if they completed construction (measured by certificate of occupancy) by June 15, 2026. That was the hard deadline.
HPD's September 19 rule creates a new pathway for projects that elected Option C or Option G to change their affordability option to one of the five tracks already carrying an existing extension to June 15, 2031. The switching pathway is open only to projects that originally filed under one of those two excluded options: A, B, D, E, and F projects were already eligible for the extension and are unaffected by the new rule.
The seven affordability options — and which five qualify.
The 421-a(16) program offered seven affordability tracks, labeled A through G. HPD's new rule grants the construction deadline extension to projects that elected Options A, B, D, E, or F. Broadly, the qualifying options range from 20 to 30 percent of units designated affordable, with income ceilings between 90 and 130 percent of AMI. All five are rental-model tracks. The specific income and percentage requirements for each option are set in RPTL §421-a(16).
Option C required a deeper affordability commitment than the other rental options. Option G was different in kind, not just degree.
| Option | Affordability model | Eligible for extension without switching options |
|---|---|---|
| A | Rental, 25% affordable | Yes |
| B | Rental, 25% affordable | Yes |
| C | Rental, deeper affordability commitment | No |
| D | Rental, 30% affordable | Yes |
| E | Rental, 20% affordable | Yes |
| F | Rental, 30% affordable | Yes |
| G | Owner-occupied, income-restricted | No |
Option G was the ownership track. It does not qualify.
Option G was the 421-a(16) pathway for buildings designed to be sold as income-restricted condominiums or cooperatives, with all units subject to owner-occupancy requirements and income ceilings set by HPD. It was the only track in the 421-a(16) program structured for affordable condo and co-op ownership, rather than income-restricted rental tenancy.
A developer who elected Option G committed to a different product in kind: no rental units, buyers subject to income verification before purchase, the building governed by a condo declaration or cooperative certificate of incorporation with the BCL and RPL obligations that structure entails.
HPD's new rule does not create a path for Option G to access the 2031 extension while preserving the income-restricted ownership structure. An Option G project can access the extension only by switching to a rental-model track (A, B, D, E, or F), which means abandoning the ownership model the building committed to. A building that committed to income-restricted condo or co-op ownership under 421-a(16) and did not obtain its certificate of occupancy by June 15, 2026 now faces a choice: abandon the ownership structure or remain outside the extension framework.
What the missed deadline means for buyers.
The 421-a tax exemption on a completed NYC condo or co-op building can reduce effective property tax liability by tens of thousands of dollars per unit per year over the exemption period. For income-restricted ownership buildings, the exemption was part of the affordability math: a below-market purchase price combined with a reduced property tax burden, together, made the units financially accessible to buyers below the income ceiling.
When a building loses 421-a(16) eligibility because its construction deadline was missed, the property taxes reflect the building's full assessed value. That difference flows to individual unit owners through common charges, maintenance, or a direct tax bill, often without advance notice.
A prospective buyer looking at a unit in a building that pursued Option G should want answers to specific questions: Did the building obtain its certificate of occupancy by June 15, 2026? If the deadline was missed, is the developer seeking any administrative resolution, and what is the status? Does the loss of the exemption change the building's pro-forma financials relative to what the offering plan projected?
New York law does not require anyone to answer these questions before closing.
New York has no disclosure requirement for this gap.
New York Real Property Law §461 explicitly excludes condominium units and cooperative apartments from the Property Condition Disclosure Act. A seller of a condo or co-op unit has no statutory obligation to disclose the building's 421-a(16) status, the construction completion date, or whether the exemption is at risk.
A buyer's attorney can request the information, and the offering plan controls for condominiums. The sponsor is required to file amendments for material changes to the plan. Whether a missed construction deadline and the resulting loss of tax exemption eligibility constitutes a material change requiring a plan amendment depends on the facts of each project. HPD and the Attorney General's Real Estate Finance Bureau do not routinely share compliance data with each other or with buyers.
The managing agent who coordinates a building's tax filings with the Department of Finance and its compliance submissions to HPD is typically the first to know when a 421-a(16) deadline is at risk. That person needs no state license. New York S.71, the managing-agent registration bill introduced by Senator Kavanagh, did not receive a committee hearing in the 2025-2026 legislative session and has no identified sponsor for 2027.
The policy choice embedded in the rule.
HPD's extension covers the five rental-model options and excludes the two tracks that did not fit the rental model: Option C's deeper affordability rental commitment and Option G's ownership structure. This is consistent with a longer pattern in NYC affordable housing policy in which rental-first programs have received more administrative flexibility and longer timelines than ownership programs. The 485-x program that replaced 421-a for new construction includes no dedicated track for income-restricted condominiums or cooperatives.
The notice of adoption does not explain why Option G was excluded. One practical reading: a rental project backed by institutional financing can more readily stretch a construction timeline than an ownership project that depends on pre-sale closings to fund construction draws. The policy choice may track a real difference between the two models rather than a value judgment about ownership versus rental.
What it also tracks is a recurring asymmetry in public information. The city's database of active 421-a(16) workbook commitments is not published as a searchable public resource. A buyer considering a unit in what was marketed as an income-restricted ownership building has no public-facing tool to verify whether the Option G commitment was met, or whether the June 2026 deadline was honored.
Bottom line.
On September 19, HPD formalized a five-year extension for most 421-a(16) projects still in the construction pipeline. The one track designed specifically for income-restricted condominium and cooperative ownership, Option G, is not covered. Option G buildings that did not obtain a certificate of occupancy by June 15, 2026 carry an unresolved question about whether their 421-a(16) exemption holds. New York law does not require the seller, the sponsor, or the managing agent to disclose this to a buyer before contract. The person most likely to know about a missed deadline needs no license, reports to no public oversight body, and has no registration requirement. The pattern is not new.
Primary sources.
- HPD Notice of Adoption: Amendment to Rules Governing RPTL §421-a(16) Workbooks — effective September 19, 2026 (NYC Rules portal)
- New York Real Property Tax Law §421-a(16) — the statute governing the affordability options and construction deadline requirements
- The Real Deal, July 7, 2026: "HPD floats 421a rule change to keep more projects alive" — on HPD's proposed rule amendment before adoption