Breaking down the J-51 tax abatement: Who is it for, and how can it help?

New York City prop­erty owners know that reno­va­tions can be a headache. They are usually costly, chaotic, disrup­tive, and they tend to take longer than expected to complete. But they’re a neces­sary part of building upkeep, and now, they’re a crucial part of helping build­ings comply with the city’s commit­ment to reduce carbon emis­sions from its built environment. 

The J‑51 tax abate­ment program exists to offer building owners a break on their tax bill to offset the cost of those frus­trating upgrades and repairs. The ratio­nale behind it is as simple as it sounds: If reno­vating a building leads to substan­tial tax cuts, owners are more likely to take on that renovation. 

The law was first intro­duced in 1955 to help New Yorkers take care of the city’s many crum­bling build­ings, and has since under­gone many updates and contro­ver­sies. The latest iter­a­tion of J‑51 was created in 2023, when Governor Kathy Hochul signed it back into New York State law, with the final city rules released in June 2025. The revived tax abate­ment was hailed as a way to meet the chal­lenge of climate change and help build­ings comply with Local Law 97 (LL97), providing some finan­cial support for substan­tial reno­va­tions like boiler upgrades, heat pump instal­la­tions, or other inter­ven­tions to adapt building energy consump­tion to the new standards. 

Yet now that J‑51 is back in place, already the clock is ticking — the tax break only applies to projects completed by June 30, 2026, leaving prop­erty owners an extremely tight window to get work done. This could change, however, due in no small part to the groups of New York City prop­erty owners lobbying the state for an exten­sion commen­su­rate with LL97’s aggres­sive clean energy time­line, and changes to the law that would make it acces­sible to more build­ings. As the future of J‑51 continues to evolve, refer back to this page for updates. 

In the mean­time, here are the basics that every New York City prop­erty owner should know. 

What is the J‑51 incentive?

The J‑51 incen­tive is a tax abate­ment, or exemp­tion, that temporarily reduces or elim­i­nates prop­erty taxes for build­ings that undergo reno­va­tions. It offers an abate­ment of up to 8.33 percent of total real estate taxes for up to 20 years, until the total abate­ment covers up to 70 percent of the total improve­ment cost, provided the work meets reason­able cost caps — more on that below. After that, a build­ing’s owner goes back to paying full real estate taxes based on the current value of the building.

For example, if a building has eligible work done for $10,000, it can get up to $7,000 back in real estate taxes over 20 years, by getting a discount of 8.33 percent of the total taxes until the discount reaches $7,000. So if the real estate taxes on that building would be $12,000 a year, an 8.33 percent discount amounts to $1,000 a year. In seven years, the building’s abate­ment will be covered — and in sum, the reno­va­tions will have cost $3,000, or just 30 percent of sticker price. 

J‑51 bene­fits are stack­able: if a building is still bene­fiting from an abate­ment for past improve­ments, a new eligible improve­ment will add an extra abate­ment. That same building could conceiv­ably take on several other projects and receive more money back overall.

To under­stand the full scale of the J‑51 benefit, prop­erty owners should keep in mind both the cost of a proposed project, and the size of their overall tax bill. Property taxes are calcu­lated based on a building’s assess­ment, or its value as estab­lished by the New York City Department of Finance (DOF). Every January, the DOF mails a Notice of Property Value (NOPV) to owners, informing them of the assessed value of their prop­erty for the year. The assess­ment is a percentage of the NOPV, which changes depending on the type of real estate. For instance, the assessed value of co-ops and condos is typi­cally 45 percent of the market value, or the income poten­tial for that prop­erty. For smaller, one- to three-unit prop­er­ties, the assessed value is much lower, at 6 percent. The city publishes all prop­erty assess­ments yearly.

What work is covered by J‑51?

The broader framing of the J‑51 incen­tive is the same as previous iter­a­tions, covering major capital inter­ven­tions, such as a new roof or a façade repair, and conver­sions from non-resi­den­tial into multiple dwellings. The 2023 version of the incen­tive, however, also covers the kind of work neces­sary to abide by LL97 require­ments, geared toward energy efficiency. 

To be eligible for the abate­ments, the inter­ven­tions need to meet a minimum cost of $1,500 per dwelling, and the cost has to be below the caps set for each type of inter­ven­tion on the city’s Certified Reasonable Cost Schedule — for instance, asbestos abate­ment has to cost $22.23 or less per square foot to access the tax break. Owners facing work that falls on the lower end of the cost spec­trum may not find the incen­tive worth their time and invest­ment, said Priya Mulgaonkar, director of the Green Co-op Council, when they account for the fees and special­ized help neces­sary to complete the process. 

What buildings are covered by J‑51?

The current J‑51 incen­tive focuses specif­i­cally on afford­able housing. Buildings are eligible if they fall into one of these four groups:

1. Buildings where the average assessed value (see above for how this is deter­mined) of each unit is under $45,000;
2. Buildings where at least half the apart­ments are desig­nated afford­able (as in, rented exclu­sively to fami­lies making 80 percent of the average median income);
3. Buildings that are oper­ated by limited-profit housing compa­nies (estab­lished specif­i­cally to build afford­able homes);
4. Buildings that receive substan­tial govern­ment assistance. 

Overall, according to the NYC Department of Housing Preservation and Development (HPD), which admin­is­ters the program with the NYC Department of Finance, about 700,000 units are eligible, or about 20 percent of the city’s total housing stock. The full list of eligible build­ings, orga­nized by neigh­bor­hood, is avail­able here. 

There is also a key provi­sion for rent stabi­lized tenants. Previous versions of the law allowed land­lords to pass the costs of reno­va­tions onto their rent-stabi­lized tenants, even if they were claiming the tax abate­ment. In order to benefit from the abate­ment, a land­lord needs to absorb the remaining 30 percent, and is not allowed to pass it on under the guise of capital improvement. 

How does the J‑51 abate­ment appli­ca­tion work?

There are several sets of forms and docu­ments to file, both before and after the work is completed, in order to get the J‑51 abatement. 

Prior to the begin­ning of the work, owners have to file: 

• A notice of intent;
• A notice to tenants (to be given between 30 and 180 days prior to the start of the work); and
• An affi­davit confirming the notice to tenants. 

Delays in filing a notice of intent are subject to a penalty of $500 or 10 percent of the appli­ca­tion fee, whichever is greater. 

After the work is complete, the order of oper­a­tions goes like this: Owners must file an appli­ca­tion and appli­ca­tion fee (more on that below), and a building addendum if the block and lot have more than four build­ings. A long list of other docu­ments and affi­davits (up to 24 total for rental build­ings and home­owner build­ings) has to be included with the appli­ca­tion, including an excel work­book, a proof of eligible costs, and a certifi­cate of compli­ance with DOB regu­la­tions. The full list of required paper­work is here. 

The appli­ca­tion docu­ments must then be emailed to HPD, but note that all affi­davits must be printed, signed, nota­rized, and sent via mail to this address:

Application fees must be filed after the work has been completed. The base J‑51 appli­ca­tion costs $1,000 for build­ings with up to six units. Buildings with more than six units must pay $75 per addi­tional unit. For small build­ings, this doesn’t make much of a differ­ence — in a ten-unit building, for example, the total appli­ca­tion cost would be $1,300 — but for larger build­ings, that extra per-unit cost can really add up. In a 500-unit building like the Victoria in Union Square, just applying for the J‑51 abate­ment would cost almost $40,000, on top of the cost of renovations. 

This extra cost, along with the complex appli­ca­tion process, is part of what advo­cates for co-op and condo owners see as the problem with the existing legis­la­tion. ​“Every program and incen­tive… for Local Law 97 has its own red tape,” said Mulgaonkar. ​“They kind of compound on each other… and become burdensome.”

When do I have to submit my J‑51 application?

Arguably the biggest chal­lenge for prop­erty owners looking to benefit from this current iter­a­tion of J‑51 is its time­line. The incen­tive applies to building reno­va­tions completed after June 29, 2022 and before June 30, 2026, and cannot take more than 30 months from begin­ning to comple­tion. For work that was completed some time ago, the dead­line to submit has already passed; abate­ments for all work completed before December 30, 2024 had to be filed by April 25, 2025. For work completed after December 30, 2024, prop­erty owners must file for the abate­ment four months after completion. 

For anyone consid­ering under­taking a project that they want offset by J‑51, it’s impor­tant to remember that the abate­ment can only be claimed once the work is completed, which means owners have just over a year left to complete reno­va­tions in order to qualify — even though the rules were only final­ized this past summer. 

Because of this, as well as the lack of aware­ness about the renewal of the program, there aren’t many build­ings that have been able to claim the abate­ment so far. Condo and co-op advo­cacy groups are now mobi­lizing to ask lawmakers to extend the dead­line until 2030 to go hand in hand with LL97 dead­lines, a move that incoming New York City mayor Zohran Mamadani supports. For now, the recom­men­da­tion from experts is that build­ings should secure financing, find a contractor, and get the work started, aiming for comple­tion in June 2026, so as to have extra time in case of delays and to apply for the abatement.