421-a Benefits Expiring: What Brooklyn Owners Should Do

The Basics

How the 421-a Exemption Works in Brooklyn

421-a was New York City’s main property tax exemption for new multifamily construction for decades. In exchange, buildings took on rent stabilization and often set aside income-restricted apartments. The exemption covers the tax increase caused by the new construction, so the land stayed taxed while the new building was largely shielded.

Brooklyn has one of the largest concentrations of 421-a buildings in the city. The 2004 Downtown Brooklyn rezoning and the 2005 Greenpoint-Williamsburg rezoning produced waves of new rental towers and mid-rise buildings, and the following years brought 421-a construction across Bushwick, Bedford-Stuyvesant, Crown Heights, Prospect Heights, Gowanus, Fort Greene and Clinton Hill. Many of those buildings are now in, or approaching, their phase-out years.

The three generations of 421-a

• Older 421-a (often called 421-a(1-15)): projects that commenced construction on or before December 31, 2015. Benefit terms of 10, 15, 20 or 25 years were common, and rules changed for projects started on or after July 1, 2008.
• 421-a(16), Affordable New York: projects that commenced construction between January 1, 2016 and June 15, 2022. Rental projects can receive up to 35 years of exemption in exchange for 25 to 30 percent affordable units, depending on the option chosen.
• 485-x, Affordable Neighborhoods for New Yorkers: the 2024 successor program for construction starting after June 15, 2022. It does not apply to buildings already receiving 421-a.

Your building’s generation determines its tax schedule, which units stay regulated and whether a 2.2 percent surcharge is available. Check the certificate of eligibility and the Department of Finance property benefit record.

The Phase-Out

How the Tax Step-Downs Actually Hit

Under the older program, the exemption is typically 100 percent for most of the benefit term and then declines in stages of about 20 percentage points until the building is fully taxable. A 10-year benefit steps down every two years. Longer benefits hold at full strength for much longer and then step down over the final several years. Exact schedules vary by benefit type and by whether the benefit is capped, so read your own building’s schedule rather than relying on a general rule.

Under 421-a(16), most rental projects receive a construction-period exemption of up to three years, then a 100 percent exemption for the first 25 years after completion, followed by 10 years where the exemption equals the building’s share of affordable units. Projects that qualified for the enhanced benefit, including certain 300-plus unit buildings in the Enhanced Affordability Area that covers parts of Brooklyn Community Boards 1 and 2 near the waterfront, receive a full 35-year exemption.

Why the increases feel so large

A newer building’s taxable value is often many times what the lot was taxed on before construction. When the exemption shrinks, the bill moves toward the full tax on a modern building. Department of Finance figures reported in 2026 showed thousands of city properties with abatements expiring through 2030. Plan for the full, unabated bill, not the one you pay today.

• Pull the Department of Finance benefit schedule for your block and lot
• Estimate the fully taxed bill using your current assessed value and tax class
• Map each step-down against your loan maturity and lease expirations
• Have a CPA model cash flow year by year through full taxation

Rent Stabilization

Which Units Stay Rent Stabilized After 421-a Ends

This question most affects your building’s value, and the answer is unit by unit. The tax benefit and rent stabilization are linked, but they do not end together, and often stabilization does not end for the tenant in place.

Older 421-a buildings

• Market-rate units: can generally deregulate at the end of the last lease entered into during the benefit period, if each vacancy and renewal lease contained a notice in at least 12-point type stating the unit will deregulate when benefits expire, with the approximate date.
• Income-restricted units, construction before July 1, 2008: HPD’s tenant fact sheet says units without government assistance cannot be deregulated until the first vacancy after the benefit period ends. Units with government assistance stay regulated through the regulatory agreement.
• Income-restricted units, construction July 1, 2008 through 2015: must stay affordable and rent stabilized for at least 35 years from completion, and tenants in place at the end keep stabilized rights for as long as they live there.
• Units stabilized before July 3, 1984: remain stabilized until the first vacancy after the benefits expire, according to the Rent Guidelines Board.

421-a(16) buildings

Affordable units must remain affordable and rent stabilized for 35 years, or 40 years for certain large buildings in Enhanced Affordability Areas, and tenants in place at the end keep their rights for as long as they stay. Market-rate units in 421-a(16) buildings are treated differently: HCR’s fact sheet says units first rented at or above the decontrol threshold are exempt, while others can be regulated. Because the 2019 Housing Stability and Tenant Protection Act and a follow-up amendment changed how these rules interact, this is an area where an attorney’s reading of your specific leases matters.

Owners of rent-stabilized buildings also face the 2026 Rent Guidelines Board order, which set 0 percent increases on one- and two-year leases beginning October 1, 2026 through September 30, 2027. For a 421-a building in its phase-out, a rent freeze on the regulated units at the same time taxes are stepping up is the squeeze many owners are feeling now. Our guide to what the NYC rent freeze means for owners covers that in detail.

Lease Riders

The Lease Rider Problem: Check Your Files Now

The single most common issue we see in Brooklyn 421-a buildings is missing or defective lease notices. Deregulation of market-rate units at expiration depends on the owner having included the required notice, in the required type size, with the approximate expiration date, in the vacancy lease and every renewal. HCR’s Fact Sheet 41 says that if the notice was not in the leases of the tenant in occupancy when benefits expire, the apartment remains rent stabilized.

Buildings that changed managers, used generic lease forms or passed through several owners are most likely to have gaps. A single missing renewal rider can matter.

What to pull together

• Every vacancy and renewal lease for each unit, with all riders
• Annual HCR rent registrations, and whether units are registered as income-restricted
• The 421-a certificate of eligibility and any HPD regulatory agreement
• Records of any 2.2 percent surcharge rider offered and signed, if applicable
• Preferential rent history, since the 2019 law generally limits increases for tenants in place to the preferential rent they pay

Overcharge claims are the other risk. If an owner treated a unit as deregulated when it legally was not, the tenant can file a complaint with HCR. The 2019 law expanded how far back rent history can be examined in many cases. Before you raise a rent to market after expiration, have counsel confirm the unit actually left regulation.

Surcharge

The 2.2 Percent Surcharge and Other Revenue Levers

In older 421-a buildings with benefits of 10 years or more, HCR allows owners to collect an annual surcharge of 2.2 percent of the rent on certain units during the phase-out period, but only with a separate 2.2 percent lease rider that the owner offers and the tenant signs. The surcharge begins when real estate taxes start to phase in. HPD notes that units in 421-a(16) buildings and certain affordable units are not eligible.

The surcharge rarely offsets a full tax step-up on its own. Owners usually combine it with other levers, each with limits:

• Market-rate leases on units that lawfully deregulate
• Tax assessment challenges through the NYC Tax Commission
• Operating cost cuts, including energy upgrades
• Ground-floor commercial leasing in mixed-use buildings

If the numbers still do not work, the building is often worth more to a buyer who prices the regulated income and the tax schedule together than it is to you as a long-term hold.

Timeline

A Practical Timeline for Owners

Owners who get the best outcomes start early. Deciding two or three years before the first step-down is far easier than six months after the first big bill.

Three or more years out

Confirm your exact schedule with the Department of Finance. Audit leases and registrations. Fix rider gaps going forward on new leases and renewals. Talk to your lender about maturity dates relative to the step-downs.

One to three years out

Model full taxation with a CPA. Get a realistic valuation from more than one source, including a direct buyer and a broker who knows regulated buildings. Decide whether to refinance, sell, or hold through the phase-out.

During the step-downs

Review each new assessment and file a Tax Commission challenge where justified. Track which leases end after the benefit period, since that is when market-rate units with proper notices can deregulate. Keep registrations current every year.

Selling

Selling a 421-a Building: Broker vs. Direct Buyer

Listing can be the better choice. If your building is fully compliant, lease files are clean, most units are market rate or will lawfully deregulate, and you have time, a competitive broker process may produce a higher price.

A direct sale tends to make more sense when one or more of these is true:

• Lease riders or registrations have gaps you do not want to litigate
• The tax step-ups are already hurting cash flow or debt coverage
• A loan maturity is coming and refinancing will not size
• Partners or heirs disagree and want a clean, private exit
• You want certainty of closing without a financing contingency

Red Hook Development buys 421-a buildings in Brooklyn all-cash and as-is. We underwrite the remaining benefit years, the regulated rent roll and the compliance record as they are, and we do not re-trade at the end because of issues we priced at the start. If you also own stabilized buildings without 421-a, see our page on selling a rent-stabilized building and our comparison of broker vs. direct buyer.

Due Diligence

What Any Buyer Will Ask For

Whether you list or sell direct, serious buyers review the same documents. Having them ready protects your price.

• Current rent roll showing regulated, income-restricted and market-rate units
• Five or more years of HCR registrations
• Leases, renewals and every 421-a and surcharge rider
• The certificate of eligibility, any HPD regulatory agreement and affordable-unit marketing records for 421-a(16) buildings
• Department of Finance tax bills and the benefit schedule
• Open HPD and DOB violations, which can affect benefits and closing
• Operating statements and the current loan terms

Gaps here do not make a building unsellable; they make a conventional, lender-financed sale harder. We regularly buy buildings with incomplete records, including buildings with open violations, because we price the risk rather than asking you to cure it.

Fine Print

Getting the Right Advice

This guide is general information, not legal or tax advice. 421-a rules differ by program generation, construction start date, benefit option and individual lease history, and the consequences of getting deregulation wrong can be significant. Before you act, have a landlord-tenant or real estate attorney review your leases and regulatory documents, and have a CPA model the tax step-ups and any sale.

Useful primary sources include the Department of Finance property benefit lookup, HPD’s 421-a pages and tenant fact sheet, HCR Fact Sheet 41 and the Rent Guidelines Board’s tax abatement FAQ. When you want to know what your building is worth as-is, we will give you a confidential number with no obligation, or you can share property details and see what we buy.