Building health · BROOKLYN, NY

640 Knickerbocker Ave

built 1910 · 3 stories · 6 apartments
Also known as 1286 Madison St — one building, several doors.
Registered with the city: 640 Realty Holdings LLC
Ownership transferred Mar 2023, no sale price · NYC Department of Finance

The building’s record over time

Filings, permits, complaints and violations from city records, newest first. Highlighted rows are unresolved and from the last year; older unresolved records are marked “never closed”. Tap any row to read it on the agency’s own site.
2026 May
Fire safety class C · closed
Housing Maintenance Code Violations
2026 May
Plumbing, moldApt 3R
Housing Maintenance Code Complaints and Problems
2026 Mar
Mold, leaksApt 2R
2024 Jan
Pests, unsanitary conditionsApt 1R
2024 Jan
Unsanitary conditionsApt 1R
2023 Mar
Ownership transferred, no sale price
NYC Citywide Annualized Calendar Sales
2020 Mar
Sprinklers permit
DOB NOW: Build – Approved Permits
2020 Mar
Plumbing permit, Heating/ventilation permit, General construction permit
2019 Nov
Alteration permit
2015 Jul
General construction permit
2007 Sep
Outside FEMA's 1% annual-chance flood zone: X
FEMA National Flood Hazard Layer
1996 Jan
Latest boiler work permit 1996
DOB Permit Issuance (BIS)
1996 Jan
Fuel burning permit, Boiler permit
DOB NOW: Build – Approved Permits
1995 Oct
Boiler burning No. 2 oil (Peerless Sct 06 PEERLESS SCT 06), registration expired since Oct 1995
Clean Air Tracking System (boiler registrations)
1910
Built
PLUTO (tax lot data)
See all records and sources
Dates are the city's record dates, shown to the month.
These are city records, not an inspection by Blueflo. Every item shows its source and the date it was last checked.
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