NYC J-51 R Sunsetting June 29, 2026: The Property Tax Abatement Co-op Boards and Rental Owners Are About to Lose (Walkthrough, Forms, and the 4-Month Filing Clock)

J-51 R, the relaunched property tax abatement for rehabilitating NYC rental, co-op, and condo buildings, expires for work completed after June 29, 2026. Here is the plain-English walkthrough of who qualifies, the forms HPD requires, the $1,000 application fee, the four-month filing clock, and what your bill actually sees from the Department of Finance.

Last updated May 27, 2026. If you own a rental building, co-op, or condo in New York City and you are in the middle of a rehab — new roof, boiler swap, façade work, heat-pump conversion, electrical upgrades — there is a property tax abatement program ending in roughly thirty days. It is called J-51 R, short for J-51 Reform, and the statute that authorizes it covers only work completed on or before June 29, 2026. After that, there is no replacement on the books yet.

This is not the original J-51 that ran for decades and expired in 2022. This is the new program created by Real Property Tax Law § 489(21) and New York City Administrative Code § 11-243.2, opened to applications by HPD on February 12, 2025. Most co-op boards we hear from have either never heard of it or assume it does not apply to them. It often does.

Here is the bill-anatomy version of what J-51 R actually does, who qualifies, what forms you file, who you call when something goes wrong, and how to read the abatement once it shows up on your Department of Finance property tax bill.

What J-51 R actually is, in plain English

Your NYC property tax bill is built in a sequence. The Department of Finance assigns your building a market value, multiplies by an assessment ratio to get the assessed value, subtracts any exemptions (STAR, SCRIE, DHE, J-51 exemption portion, etc.), and then multiplies the result by your tax class rate. For fiscal year 2026, those rates are Class 1 at 19.843%, Class 2 at 12.439%, Class 3 at 11.108%, and Class 4 at 10.848%. That product is your gross tax. Then the Department of Finance subtracts your abatements — the J-51 R abatement, the co-op/condo abatement, and so on — to get the amount you actually owe.

The J-51 R benefit lands in that last step. According to HPD, it provides an abatement of existing real property taxes of up to 8 1/3 percent of the certified reasonable cost of the rehabilitation work each year, for up to 20 years, capped at a cumulative 70 percent of those approved costs. In English: if HPD certifies that your building spent $600,000 on eligible rehab, you can reduce your annual property tax by roughly $50,000 a year, until you have used up $420,000 in cumulative abatement or hit the 20-year cap, whichever comes first.

It is the only City program right now that lets a co-op or rental owner finance a roof or a Local Law 97 heat-pump conversion out of the property tax bill instead of out of maintenance increases or MCI rent hikes. And the door closes for any work completed after June 29, 2026.

Who qualifies (and the part most boards get wrong)

HPD's J-51 Reform page lists three eligibility buckets. Read them carefully because the rules are different for rentals versus homeownership.

Eligible Rental Building

Class A multiple dwelling, all units operated as rental housing
Not operating, in whole or in part, as a hotel
And one of these is true: at least 50% of the dwelling units are qualifying rental units with maximum rents at or below 30% of 80% AMI and registered with DHCR; OR the building is owned by a Mitchell Lama limited profit housing company or redevelopment company; OR the building receives substantial governmental assistance

Rental owners must permanently waive any MCI rent increase for work covered by J-51 R, and certain units must stay rent-stabilized for at least the J-51 R Restriction Period. That MCI waiver is the trade.

Eligible Homeownership Building (the co-op and condo bucket)

Class A multiple dwelling operated as a condominium or cooperative
Not operating, in whole or in part, as a hotel
Has an average assessed valuation no greater than $45,000 per dwelling unit as of the Commencement Date of the eligible construction

This is the line every board needs to check. The previous threshold under the old J-51 was $30,000 per unit (raised to $40,000 by later amendments to Admin Code § 11-243(d)(8)(b)(ii)). The J-51 R bar is higher: $45,000 per unit. That covers a meaningful chunk of outer-borough and Upper Manhattan co-ops that did not qualify under the prior regime. Pull your most recent Notice of Property Value, divide the assessed value by the number of dwelling units, and check the number before you assume you are out.

Eligible Regulated Homeownership Building

Class A multiple dwellings owned and operated by a Mitchell-Lama mutual housing company under PHFL Article II, or a mutual redevelopment company under PHFL Article V. No per-unit assessed value cap applies to this bucket.

What counts as Eligible Construction

Per HPD's published rules and program page, Eligible Construction means alterations or improvements that:

Appear on HPD's certified reasonable cost schedule
Meet the minimum scope threshold of $1,500 per dwelling unit
Have a completion date after June 29, 2022 and before June 30, 2026
Take no more than 30 months from commencement to completion
Do not add cubic content to the building (no horizontal or vertical enlargements)

The press release from HPD when the program launched on February 12, 2025 named the practical examples: roof replacement, façade repair, structural stabilization, heating, plumbing, electrical, energy efficiency upgrades (insulation, high-performance windows, heat pumps, modernized hot water systems, expanded electrical capacity to support electrification). The City explicitly designed J-51 R to help building owners comply with Local Law 97 carbon caps without passing the cost through to tenants.

The filing clock — this is where most owners blow it

J-51 R has two different deadline regimes depending on when the work finished. From the HPD program page, verified May 27, 2026:

Projects that completed construction on or before December 30, 2024: Application was due on or before April 30, 2025. That window is closed.
Projects that completed construction after December 30, 2024: Application is due within four (4) months of the Completion Date.

That four-month window is unforgiving. If your boiler-replacement signoff comes in on June 1, 2026, your J-51 R application is due to HPD by October 1, 2026. Miss it and you have lost the abatement for that work entirely.

There is also a pre-commencement requirement for any project that started construction on or after December 30, 2024. Before breaking ground you must file:

Form D4a, Notice of Intent to File for J-51 R Tax Abatement, not less than 15 days before the start of rehabilitation
Form D4b, Affidavit Confirming Notice to Tenants
Form D4c, Notice to Tenants, posted in prominent public places in the building and delivered to tenants at least 30 days (and not more than 180 days) before the Commencement Date

Failure to file the Notice of Intent on time triggers a penalty equal to the larger of $500 or 10% of the application fee. Any project that started on or after December 30, 2024 and failed to give tenants the required pre-commencement notice (the proposed work, the building representative's contact info, and tenant rights) is simply ineligible for J-51 R.

The forms you actually file (the HPD packet)

HPD's J-51 R packet is filed through the J-51 R Online Application, with notarized affidavits also mailed in hard copy. The core list, all available from HPD:

Form B1 — J-51 Application (fillable PDF)
Form B2 — J-51 R Workbook (Excel; itemized claimed costs, rents, homeownership unit info)
Form C4 — Affidavit of Non-Duplication (only if the building previously received J-51 benefits)
Form D3a — Affidavit of Ownership and Energy Star Compliance
Form D3b — Affidavit of No Harassment (all 10%+ owners listed; co-op/condo signed by an authorized board member)
Forms D5a / D5b — Affidavits of Violation Clearance (with HPD Violation Search Report dated no more than 45 days before filing)
Form E2 — Certificate of Compliance with Department of Buildings Regulations
Form E3 — Architect's/Engineer's Affidavit on commencement and completion dates (where the work did not require a DOB permit)
Form D8 — CPA letter attesting to the accuracy of the claimed cost information on Form B2
Form D7a — Owner's Declaration of Waiver of MCI Rent Adjustment (rentals only; also filed with DHCR)
Most recent DHCR Form RR-2S Rent Registration Summary (rentals only)
Opinion of counsel, offering plan, and DOF tax history showing per-unit assessed value at commencement (co-ops and condos only)
Applicable regulatory agreement (Mitchell-Lama, redevelopment company, or substantial governmental assistance projects)

The application fee is $1,000 plus $75 per dwelling unit in excess of six, paid by wire or ACH to the City of New York. A 90-unit co-op pays $1,000 + 84 × $75 = $7,300.

HPD certifies. Department of Finance pays.

This is the structural fact every applicant has to internalize: HPD does not put money on your tax bill. HPD reviews the application and, if everything checks out, issues a Certificate of Eligibility and Reasonable Cost. That certificate is then submitted to the Department of Finance along with DOF's own J-51 Property Tax Exemption and Abatement Application. The Department of Finance is the agency that actually applies the abatement to your property tax bill, which is why DOF maintains its own J-51 Exemption and Abatement page with the benefit-lookup spreadsheets by borough.

If you want to confirm a building currently receives J-51 benefits, DOF publishes annual rolls of J-51 exempt/abatement properties for each borough, and the live property account lookup at nyc.gov/site/finance shows the line item on the bill itself.

How J-51 R shows up on your bill (the line you are looking for)

The last page of your NYC property tax bill is where the math lives. DOF lays it out in this order: market value, assessed value, exemption amount, taxable value, tax rate, gross tax, abatement amount, net property tax due. J-51 has two pieces and they show on two different lines:

The J-51 exemption reduces taxable value — it shields the assessed-value increase that resulted from the rehab work, so the tax rate is applied to a lower base.
The J-51 abatement is subtracted from gross tax — this is the 8 1/3 percent annual line, and it is what most people mean when they say their building has J-51.

If the bill shows a credit you do not understand, DOF's Property Tax Bill FAQ explains the standard line items, and the agency directs general bill questions to 311 (or 212-NEW-YORK from outside the city).

Phone numbers and contacts you will actually need

HPD J-51 customer service: J51_customer_service@hpd.nyc.gov
HPD Division of Housing Incentives mailing address (J-51 R): 100 Gold Street, Room 8C-09, New York, NY 10038
NYC Department of Finance — general bill help: Call 311 (212-NEW-YORK from outside NYC) or schedule an appointment through nyc.gov/site/finance
NY State Division of Housing and Community Renewal (DHCR) — rent registration: 1-866-275-3427 (1-866-ASK-DHCR)

What happens after June 29, 2026

Right now, no published successor to J-51 R covers post-June-29-2026 completion dates. The State authorized the program through June 29, 2026, and that statutory cutoff is what HPD enforces. If Albany extends the program in a future legislative session, HPD will republish the rules. Until then, treat the date as a hard cliff. If your rehab will finish in July 2026, the J-51 R line on your tax bill does not exist.

For owners with work already wrapping up in May or June, the practical move is:

Confirm your Completion Date with your architect or engineer (Form E3) before June 29, 2026
Pull a fresh HPD Violation Search Report and a DOB violations printout within 45 days of your planned filing
Run your B2 Workbook against HPD's certified reasonable cost schedule — if a line item is not on the schedule, it will not generate an abatement
Calendar the four-month filing clock the day signoff comes in
For rentals, get the D7a MCI waiver filed with both HPD and DHCR simultaneously

Where this fits on your bill versus the other abatements

Three things often live on the same NYC property tax bill and people conflate them. They are different programs, run by different agencies, with different forms:

J-51 R — rehabilitation abatement. HPD issues the certificate, DOF applies the line item. Ends June 29, 2026.
421-a / Affordable New York — new construction exemption for projects that began before June 15, 2022. Replaced going forward by 485-x, the Affordable Neighborhoods for New Yorkers program (RPTL § 485-x), authorized for projects commenced through June 15, 2034 and completed by June 15, 2038.
Co-op and Condo Property Tax Abatement — a separate DOF-administered abatement of 17.5% to 28.1% (tiered by average assessed unit value) for primary-residence co-op and condo owners. It applies regardless of whether the building has J-51 R.

A co-op that completes a heat-pump conversion this June can, in theory, see J-51 R abatement, the co-op/condo abatement, and the standard Class 2 tax rate all working together on the same bill. The math compounds in your favor — if you file in time.

Where to start tonight if this is the first you are hearing of J-51 R

Read HPD's program page: nyc.gov/site/hpd/services-and-information/tax-incentives-J-51-reform.page
Pull HPD's J-51 R FAQs (PDF dated April 23, 2025) for the edge cases on commencement-date rules
Confirm your per-unit assessed value against the $45,000 ceiling (co-ops and condos) using your most recent Notice of Property Value
Email J51_customer_service@hpd.nyc.gov with a one-paragraph description of your project, your completion date (actual or expected), and your building class — ask for written confirmation that the project is in the eligible window
If you are within four months of a completion date in 2026, do not wait. Start the B2 Workbook and the D8 CPA letter now

Tax advice in this article is informational. Consult a tax professional or the NYC Department of Finance for your specific situation.

Primary sources verified May 27, 2026: