Your Building's 421-a Is Expiring? The 2-Year Lease Move to Make Now
If your apartment is rent-stabilized only because the building gets a 421-a tax exemption, your stabilization does not vanish the day the exemption ends. It lasts until the end of the last lease you signed while the exemption was active. That means signing a 2-year renewal before expiration locks your stabilized status, and this cycle's 0% freeze, for the full two years. And one more thing: if the landlord ever skipped a required deregulation notice, the unit may never leave stabilization at all.
Thousands of newer NYC buildings are stabilized not by age but by a tax deal: the landlord took the 421-a exemption and accepted stabilization in exchange. Those exemptions are now expiring across the city, and tenants are getting letters that read like eviction countdowns. Here is what actually happens, and the two facts that shift the power back.
What is 421-a stabilization, and why is it different?
Classic rent stabilization comes with the building (generally 6+ units, built before 1974) and does not expire. 421-a stabilization comes with a tax break, and when the break ends, the landlord can begin removing units from stabilization.
The key word is "begin." It is not a switch that flips on expiration day.
What to do: First confirm which kind you are. Your rent history from HCR (free) shows the unit's registration, and the building's 421-a status is on the HPD site.
The rule that buys you time: the last lease wins
Per the Rent Guidelines Board and HPD's guidance, when a 421-a exemption expires mid-lease, the unit stays stabilized until the end of the last lease signed while the exemption was still active.
Play that forward. Exemption ends March 2027. You sign a 1-year renewal starting October 2026: protected until October 2027. You sign a 2-year renewal starting October 2026: protected until October 2028, a year and a half past the expiration.
And because the 2026 to 2027 cycle froze stabilized renewals at 0% for both 1 and 2 year terms, that 2-year lock currently costs nothing extra.
What to do: If your building's exemption is ending, take the 2-year renewal, and make sure its start date lands while the exemption is still active. You are converting a tax calendar into two more years of stabilized rent.
The notice loophole: some units can never be deregulated
To remove a 421-a unit from stabilization after the exemption ends, the landlord must have included a specific notice, in 14-point type, in your original lease AND in every single renewal: a statement that the unit is stabilized due to the exemption and will leave stabilization when it expires.
Skipped it once, in any lease or renewal? Courts have held the unit cannot be deregulated on that basis. Not delayed. Not fixable retroactively. The unit stays stabilized.
What to do: Pull out every lease and renewal you have signed. Look for that 14-point notice in each one. A single missing notice is a serious defense, worth a consult with a tenant attorney or Met Council before you accept any "your unit is now market rate" letter.
My landlord already sent a "market rate" renewal. Now what?
Do not sign it reflexively, and do not panic either. Check three things in order:
- Was the last lease you signed executed while the exemption was active? If yes, you are stabilized until it ends.
- Does every past lease contain the 14-point notice? If not, deregulation itself is in question.
- Is the proposed increase even lawful under Good Cause Eviction, which caps many market-rate increases near 8.79%?
What to do: Reply in writing asking the landlord to state the unit's regulatory status and the basis for it. Then verify against your HCR rent history rather than their letter.
Common questions
Does my rent jump to market rate the day 421-a expires?
No. Your current lease runs to its end at its current terms, and stabilization holds until the end of the last lease signed while the exemption was active. Expiration starts a process, not a cliff.
Should I take the 1-year or 2-year renewal if the exemption is ending?
The 2-year, almost always. It extends your stabilized protection further past the expiration date, and in the 2026 to 2027 cycle both terms carry a 0% increase, so the longer lock is free.
What is the 14-point notice, exactly?
A legally required statement, printed in 14-point type in the original lease and every renewal, disclosing that the unit is stabilized because of the 421-a exemption and will exit stabilization when it expires. Missing from any lease in the chain, and the landlord's path to deregulation breaks.
How do I find out when my building's exemption expires?
Look up the building's tax exemption status via HPD's 421-a resources or the Department of Finance property records, and cross-check your unit's registration in your HCR rent history.
Sources: NYC HPD, 421-a · NYC Rent Guidelines Board · NY HCR, rent history
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