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Multiple Dwelling A
Permanent residences. The majority of stabilized buildings.
421-A
Tax exemption for new construction. Stabilization can end when exemption expires.
Multiple Dwelling B
Transient housing — hotels, rooming houses, SROs.
J-51
Tax exemption for major rehab. Most vulnerable to losing stabilization.
Status Codes
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421-A (1-15)
Years 1-15. Still in the active tax break window.
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421-A (16)
Year 16+. Tax break expired — stabilization may be at risk.
421-A and J-51 buildings are stabilized because the owner took a tax deal. When those programs expire, the building can legally exit stabilization.
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NYC DHCR Building File
All 5 Boroughs — 2024
Data via Supabase
All 5 Boroughs — 2024
Data via Supabase