421-a (16) Applications and Compliance in NYC

For a project seeking Affordable New York benefits under 421-a (16), the starting point is its construction history and filing record. Discuss your application status, completion documents and ongoing requirements with MGNY, whether you are preparing a filing or reviewing an existing benefit.

This page concerns 421-a (16). Earlier benefits are covered by our Old 421-a service, and later development may require a review of 485-x.

Which projects should review 421-a (16)?

HPD describes the program as generally covering construction commenced from January 1, 2016 through June 15, 2022, with an ordinary completion deadline of June 15, 2026, which has passed. Certain projects commenced on or before December 31, 2015 may opt in if they have not yet received 421-a benefits. A qualifying extension moves completion to June 15, 2031 for Affordability Options A, B, D, E or F, subject to conditions including a Letter of Intent filed by September 12, 2024.

The extension is not a new opportunity to submit that Letter of Intent. Check the project’s actual dates, selected option and filing evidence against HPD’s current 421-a instructions.

What needs to be established before filing?

• Construction dates: The documented commencement and completion dates and their effect on the applicable program.
• Affordability option: The option selected and the project’s unit allocation and use.
• Extension record: If relying on the later completion deadline, the Letter of Intent and evidence of timely submission.
• Application status: Prior submissions, HPD correspondence and any outstanding requests.
• Existing benefit: Any certificate or approval already issued and the benefit shown on the tax bill.

What about homeownership projects?

For Option D, HPD lists projects outside Manhattan containing no more than 35 units, with an average assessed value no greater than $65,000 per unit at the first assessment after completion. Each purchaser during the benefit period must agree in writing to use the unit as a primary residence for at least the first five years of ownership. The construction dates, extension record and application requirements still need to be checked.

Application timing and ongoing compliance

HPD states that the application is due within one year after completion. Confirm the applicable completion date and requirements before calculating the filing deadline. A filing review should also distinguish the documents needed for the application from the obligations that continue after approval.

For rental projects, affordable-unit marketing and ongoing compliance belong in that discussion. Bring the regulatory agreement, unit schedule and relevant agency correspondence so the project-specific requirements can be identified. Do not assume that an application, certificate or tax bill alone answers every compliance question.

Our HPD lottery management service explains the tenant-screening and leasing process. For stabilized-unit records, see DHCR registration and compliance. If the issue is an existing benefit that has disappeared, see benefit reinstatement.

Discuss your project’s next step

Contact MGNY or call (212) 343-1111 with the property address, construction dates, selected option and current filing status. Use the consultation to agree the application or compliance assistance needed for your project.

For background, read what 421-a is. Program information checked September 14, 2026 against the linked HPD guidance.

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