If you live in a building receiving the 421-a tax abatement, your apartment is rent-stabilized for as long as the tax benefit lasts, and if you live in a designated affordable unit, that stabilization runs for 35 years. The 421-a tax abatement’s rent stabilization rules for tenants cap your annual rent increases at percentages set by the Rent Guidelines Board, give you the right to renew your lease, protect family members through succession, and sharply limit the circumstances under which your unit can ever be deregulated. Those protections apply whether you pay $1,200 or $5,000 a month, because coverage attaches to the apartment itself, not to the rent level or the tenant.
Your Unit Is Stabilized for the Life of the Tax Benefit
Under New York Real Property Tax Law Section 421-a, every market-rate rental unit in a building receiving the benefit is rent-stabilized for the entire benefit period, and every affordable rental unit is stabilized for 35 years.1Housing Preservation & Development. 421-a Ownership changes don’t affect this. Neither does the initial rent level.
How long your building’s benefit lasts depends on where it sits and what the developer committed to. Buildings in Manhattan’s exclusion zone (roughly 14th to 96th Streets) got 10-year exemptions. Buildings in the outer boroughs or upper Manhattan qualified for 15 years as of right. Projects that set aside at least 20 percent of units for lower-income households could receive 20-year or 25-year exemptions depending on location and structure.2Independent Budget Office. 421-a Tax Fiscal Brief Some buildings later qualified for extensions of another 10 to 15 years on top of that.
Owners must register every unit annually with the New York State Division of Housing and Community Renewal (DHCR).3Homes and Community Renewal. Rent Registration You can request a copy of your apartment’s registration history from DHCR, and that record is the starting point for confirming your legal rent and your stabilization status.
How Your Legal Rent Was Set
Your starting rent wasn’t picked out of the air. Before HPD issued a certificate of eligibility for your building, it had to determine an initial adjusted monthly rent for your apartment using a set formula. That formula folds in operating costs, vacancy reserves, management fees, projected property taxes, and 14 percent of total project costs (to cover debt service), then subtracts expected commercial income from the building.4NYC Rules. 28 RCNY 6-04 – Determination of Initial Rent and Rent Increases The total gets divided by 12 months and by the building’s room count to produce a per-room monthly rent, then multiplied by your apartment’s room count.
Why should you care about the formula? Because the number HPD approved becomes the legal registered rent filed with DHCR, and every future Rent Guidelines Board increase compounds on top of it. If the starting number was wrong, every rent you’ve paid since is wrong too. Overcharge disputes sometimes trace all the way back to an improperly set initial rent.
What Your Landlord Can Raise the Rent By Each Year
Annual increases on your renewal lease are capped at percentages voted on each year by the New York City Rent Guidelines Board (RGB), with separate rates for one-year and two-year renewals. For leases starting between October 1, 2025, and September 30, 2026, the approved increases are 3% for a one-year renewal and 4.5% for a two-year renewal.5New York City Rent Guidelines Board. 2025 Apartment and Loft Order 57 Your landlord cannot exceed those numbers, and there’s nothing to negotiate.
The rates change each year. In recent decades, one-year increases have ranged from 0% (the Board froze rents outright in 2015–16, 2016–17, and 2020–21) to 5% or more in the 1990s.6New York City Rent Guidelines Board. Rent Guidelines Board Apartment Orders 1 Through 55 The Board typically announces new rates in June, effective for leases beginning that October. Any charge above the applicable RGB rate is a rent overcharge.
The 2.2% Phase-Out Surcharge
As your building’s 421-a exemption enters its phase-out period (when the exemption percentage steps down gradually rather than dropping to zero all at once), your landlord can collect a 2.2% annual surcharge to offset rising property tax costs. This surcharge follows its own rules.
The 2.2% is calculated each year against the rent charged on the date the phase-out began, not the current rent. It doesn’t compound with RGB increases, and it isn’t technically part of your legal regulated rent. Your landlord can add it annually during the phase-out period, and it stops accruing once the tax benefit fully expires.7Homes and Community Renewal. Surcharges and Fees
Collection requires advance notice. Your lease must include a rider, signed by you and printed in at least 12-point type, disclosing the landlord’s right to collect the surcharge and the approximate date the 421-a benefits expire. If the rider was never in your original vacancy lease, DHCR permits the owner to add it to a renewal lease, but the surcharge can only be collected going forward from that point. Retroactive charges for prior years of the phase-out are not allowed.7Homes and Community Renewal. Surcharges and Fees
Preferential Rents Are Yours to Keep
Many tenants in 421-a buildings pay a “preferential rent” below the legal registered rent. This was common when new buildings were leasing up and owners wanted to fill vacancies quickly. They’d offer below-market deals while registering a higher legal rent with DHCR, and before 2019, they could raise the tenant’s rent all the way to that legal number at renewal.
The Housing Stability and Tenant Protection Act of 2019 ended that. If you were paying a preferential rent on or after June 14, 2019, that preferential rent is yours for the duration of your tenancy. Your landlord can only apply RGB-approved increases to the preferential rent, not to the higher legal rent, while you remain in the apartment. The owner can charge up to the legal rent only after you permanently vacate, and only if the legal rent was properly written into both the vacancy lease and every subsequent renewal. DHCR registration alone doesn’t preserve the legal rent for future use.8New York State Homes and Community Renewal. Fact Sheet 40 – Preferential Rents
Lease clauses that try to terminate your preferential rent if you pay late or miss some other condition are unenforceable under the 2019 law.
The Lease Rider You Must Receive
Every tenant in a 421-a building must get a standardized rider attached to the initial vacancy lease and every renewal lease. The rider has to state that the apartment is rent-stabilized because of the 421-a benefit, identify the approximate date the benefit is scheduled to expire, and indicate whether the unit will be deregulated when the benefit ends.9NYC Department of Housing Preservation and Development. 421-a and Rent Stabilization Tenant Fact Sheet If the landlord intends to collect the 2.2% phase-out surcharge, the rider must disclose that too. The notice has to be printed in at least 12-point type.
The font-size rule isn’t decorative. For buildings where construction started before July 1, 2008, the owner can only deregulate a market-rate unit after the benefit expires if every prior lease and renewal for that tenant included the required notice. The same rule applies to buildings that started construction between July 1, 2008, and December 31, 2015.9NYC Department of Housing Preservation and Development. 421-a and Rent Stabilization Tenant Fact Sheet Miss one renewal, and the owner can lose the ability to deregulate that unit at all.
If you never received the rider, or you received it for some leases but not others, save that fact. It becomes powerful leverage if the landlord later tries to deregulate.
When and How Your Unit Can Be Deregulated
What happens at the end of the benefit period depends on whether your unit is market-rate or affordable, and on whether your landlord followed the notice rules every time.
Market-Rate Units
For a market-rate unit where the landlord properly included the required notice in every lease and renewal, the apartment can be deregulated at the first lease renewal after the benefit period ends.10Rent Guidelines Board. Deregulation FAQs Your current stabilized lease runs to its expiration; deregulation doesn’t happen mid-lease. When that lease is up, the landlord can offer a free-market renewal at whatever rent the market supports, or decline to renew, subject to other applicable laws.
If the landlord failed to provide the notice in even one lease cycle, your unit may remain rent-stabilized past the benefit period. If you believe you were improperly deregulated, you can file a challenge with DHCR to restore your stabilized status.
Affordable and Income-Restricted Units
Affordable units follow a longer timeline. Under 421-a, income-restricted units must remain rent-stabilized for 35 years regardless of how long the tax benefit itself runs.1Housing Preservation & Development. 421-a A building with a 25-year tax exemption keeps its affordable units stabilized for a full decade after the tax benefit ends. After the 35-year affordability period expires, affordable units revert to free-market status upon the first vacancy.
High-Rent Deregulation No Longer Exists
Before 2019, landlords could deregulate a rent-stabilized unit once the rent crossed a certain threshold and the apartment became vacant, or if the tenant earned over $200,000. The Housing Stability and Tenant Protection Act of 2019 repealed both high-rent vacancy deregulation and high-income deregulation.11Homes and Community Renewal. Housing Stability and Tenant Protection Act of 2019 – Rent Laws Overview Your 421-a unit cannot be deregulated because the rent has risen above some dollar figure. The only path to deregulation is expiration of the benefit period combined with proper notice.
Succession Rights for Family Members
Because your apartment is rent-stabilized, a family member can inherit the lease through succession rights if you die or permanently leave. To qualify, that person must have lived in the apartment as a primary resident with you for at least two years immediately before your departure. For seniors and people with disabilities, the requirement drops to one year.12Homes and Community Renewal. Fact Sheet 30 – Succession Rights
“Family member” is defined broadly. It covers spouses, parents, children, siblings, grandparents, grandchildren, and in-laws, and it also covers any person who can show emotional and financial interdependence with the tenant. DHCR weighs factors like how long the relationship lasted, whether the two people shared finances or household expenses, whether they attended family events together, and whether they took legal steps like naming each other in wills or granting powers of attorney.12Homes and Community Renewal. Fact Sheet 30 – Succession Rights No single factor decides it, and evidence of a sexual relationship is neither required nor considered.
Succession claims matter more in 421-a buildings because the stabilized rent often sits well below what the unit would fetch on the open market. Owners have a financial reason to challenge those claims. Keep documentation of shared residence organized and accessible: utility bills, tax returns listing the address, government correspondence, anything that puts both names at the apartment during the qualifying period.
Filing an Overcharge Complaint
If you believe your landlord is charging more than the legal regulated rent, whether through improper surcharges or increases above the RGB-approved percentage, you can file an overcharge complaint with DHCR’s Office of Rent Administration using Form RA-89.13Homes and Community Renewal. Rent Increases and Rent Overcharge Submit all supporting documentation at the time of filing: canceled checks, lease copies, rent receipts, and any records of individual apartment improvements the landlord claims to have made.
Before you file, request a computer printout of your apartment’s registration history from DHCR. That printout shows the rent your landlord registered over the past six years, and comparing it to what you actually paid often surfaces the discrepancy. Submit two copies of the completed complaint and documentation, and keep a third for yourself.14Homes and Community Renewal. Tenants Complaint of Rent and Other Specific Overcharges in a Rent Stabilized Apartment – RA-89 Incomplete complaints get sent back.
If DHCR finds an overcharge, it will issue an order setting the correct legal rent and the refund owed to you. Where the overcharge was willful, meaning the landlord knew or should have known the rent was illegal, DHCR can assess treble damages, so you could receive up to three times the amount you were overcharged.13Homes and Community Renewal. Rent Increases and Rent Overcharge You can collect through an offset against future rent or by obtaining a judgment.
If You’re Moving Into a Newer Building
The 421-a program is no longer accepting new projects. Its successor, Section 485-x of the Real Property Tax Law (the “Affordable Neighborhoods for New Yorkers” or ANNY program) enacted in 2024, treats market-rate units differently. Under 485-x, a market-rate unit is only rent-stabilized if it would have been stabilized without the tax benefit, for example if the building has six or more units and falls under the Rent Stabilization Law on its own.15New York State Senate. New York Real Property Tax Law 485-X – Affordable Neighborhoods for New Yorkers Affordable units in 485-x buildings, on the other hand, remain rent-stabilized in perpetuity rather than reverting after 35 years.
If you already live in a 421-a building, none of this changes anything about your existing protections. Your unit stays governed by the 421-a regulatory agreement and rent stabilization rules until that agreement expires on its original terms.