J-51 Tax Exemption and Abatement for Owners

J-51 is a New York City property tax break for owners who repair or upgrade existing apartment buildings. The current version, called J-51 Reform (J-51 R), lets a qualifying rental building, or a co-op or condo with low assessed values, reduce its existing property taxes by up to 8⅓% of the approved cost of the work each year, up to 70% of that cost in total.

The program is run by the Department of Housing Preservation and Development (HPD), and the Department of Finance (DOF) applies the savings to the tax bill. It matters to co-op shareholders because a big capital project such as a roof, a facade or a heating upgrade can be partly paid for by lower taxes, which flow through to maintenance. It matters to renters because J-51 comes with rent stabilization rules.

Old J-51 vs J-51 R

J-51 has existed for decades under New York Real Property Tax Law §489 and the city’s Administrative Code §11-243. The original program stopped accepting work completed after June 29, 2022. HPD says the city passed local enabling legislation in December 2024 and relaunched the program as J-51 R in February 2025, covering work completed after June 29, 2022.

If you own in a building that got original J-51 benefits, those benefits keep running on their old schedule. A new project today goes through J-51 R.

Who qualifies for J-51 R

HPD lists three kinds of eligible buildings. All must be Class A multiple dwellings (permanent apartments) and not run as a hotel.

• Rental buildings where at least half the units are rent-regulated and registered with the state housing agency (DHCR) with maximum rents at or below 30% of 80% of Area Median Income (AMI), or buildings owned by a Mitchell-Lama company, or projects receiving substantial government assistance.
• Co-ops and condos with an average assessed value of no more than $45,000 per dwelling unit as of the date work starts.
• Regulated homeownership: Mitchell-Lama mutual housing companies and mutual redevelopment companies.

What work counts

The work must be on HPD’s schedule of certified reasonable costs, cost at least $1,500 per dwelling unit, and be completed no more than 30 months after it started. It cannot add cubic content to the building, so an extension or added floor does not count. HPD’s 2025 announcement names roof replacements, facade repairs, structural stabilization, heating, plumbing and electrical upgrades, and energy efficiency improvements. Those are the same projects many buildings are planning for Local Law 97 and facade inspections.

How the money works

J-51 R is an abatement: it reduces the building’s existing property tax bill. HPD certifies the reasonable cost of the work. Each year the building can take up to 8⅓% of that cost off its taxes, for up to 20 years, until total savings reach 70% of the certified cost.

In a co-op, the abatement lowers the building’s tax bill, which the board passes through as lower maintenance or uses to pay down a loan taken for the work. In a condo, where each unit is taxed as its own parcel, ask the board how the abatement is applied to unit tax bills. The actual yearly amount depends on HPD’s certified cost and on how much tax the building owes; this example is just arithmetic.

Rent stabilization and J-51

J-51 has always been tied to rent regulation. HPD says rental units in a J-51 building stay rent stabilized for the benefit term, and its 2025 announcement adds that units which became stabilized because of J-51 cannot be deregulated during the benefit or during any tenancy that began while the benefit was in effect.

Under J-51 R the owner must also permanently give up a Major Capital Improvement (MCI) rent increase for the work that receives the tax break, so tenants are not charged twice for the same project. Under the original program, MCI increases were allowed but reduced by part of the abatement. See MCI and IAI rent increases.

What happens when J-51 ends

An abatement that runs out simply stops reducing the tax bill. For a co-op, that means the building’s taxes go up by the amount it was saving, and the board has to cover the gap, usually through maintenance. Original J-51 exemptions ended in steps too: the last four years of each 14- or 34-year term are a phase-out, so taxes rose gradually before the exemption ended.

Before you buy into a building with J-51, ask:

• When does the benefit end, and is the end built into the building’s budget?
• How much of the current tax bill is offset by J-51 and other abatements?
• Are there other benefits stacking, such as the co-op/condo abatement or 421-a?

Our 421-a and J-51 expiry calculator estimates how much a building’s taxes rise when a benefit ends. The offering plan amendments, audited financials and DOF tax bill usually show the benefit and its end date.

How a board applies

1. 1

   Check eligibility before work starts

   Confirm the building type and the average assessed value per unit as of the commencement date.
2. 2

   File a Notice of Intent on time

   HPD requires the Notice of Intent (Form D4a) at least 15 days before work starts. Filing late costs the larger of $500 or 10% of the application fee.
3. 3

   Keep the scope on HPD’s cost schedule

   Only listed items at certified reasonable costs count, with at least $1,500 per unit, finished within 30 months.
4. 4

   Apply after completion

   Projects completed after December 30, 2024 must apply within four months of completion. Fees are paid by wire or ACH.
5. 5

   DOF applies the abatement

   Once HPD certifies eligibility, the Department of Finance reflects the abatement on the tax bill.

The June 2026 deadline and the proposed extension

1. June 29, 2022

   Original J-51 closes

   No applications for work completed after this date.

2. December 2024

   City passes enabling law

   HPD relaunches the program as J-51 R in February 2025.

3. June 29, 2026

   Current completion deadline

   HPD is still reviewing applications for work completed on or before this date.

4. Pending

   Extension to June 30, 2036

   State law authorizes it, but it takes effect only if the City Council enacts the full extension.

Bottom line for co-op and condo owners

If your building is lower-value and facing a roof, facade or electrification project, J-51 R can return up to 70% of the approved cost over time. Ask your board whether it has checked eligibility, and see how the project may affect special assessments and the co-op/condo abatement you already get.