657 Knickerbocker Avenue, Brooklyn

Recurring heat calls and persistent bathroom mold violations mark this Bushwick rental.

This eight-unit Bushwick walk-up shows nine open housing code violations on file, including a Class C immediately hazardous violation. While the building keeps a smaller footprint of reported issues, the surrounding blockface stays lively. Three things to know:

Heat outages hit the whole building during cold snaps. The building logged 8 heat and hot water complaints over the past three winters, with multiple calls reporting entire-building outages as recently as February 2026. Given the pre-war setup, winter heat distribution is an active area to test.

Bathroom mold citations keep coming back in unit 1F. Code enforcement cited apartment 1F for visible bathroom mold across three separate inspections in 2024 and 2025. Repeating mold violations in the same wall cavity usually point to an unresolved riser leak upstairs.

The surrounding three blocks carry heavy late-night noise and street activity. Within three blocks, neighbors logged 253 residential noise calls over the past year—mostly loud music and parties—and 225 illegal parking calls concentrated around blocked hydrants and sidewalks. Street activity stays active late.

Quieter signals on this building and the blocks around it:

• Single Class C open violation recorded alongside eight Class B open violations
• One open violation for broken fire escape egress window bars filed in 2022
• Lead kit request logged from the building in June 2025

657 Knickerbocker Avenue is a 8-unit building in Brooklyn, New York City (BBL 3033650100). Brix tracks 9 open HPD violations for this property, along with inspection history, DOB filings, tenant complaints, and rent stabilization status.

Built in 1931, this walk-up apartment building sits in Brooklyn and is tracked by Brix using public NYC records from HPD, DOB, ACRIS, and 311.

Tenants have filed 84 HPD complaints about this building over the last five years, most often about heat/hot water.

What tenants have called the city about here over the last five years:

• Heat/hot Water: 30 complaints
• Unsanitary Condition: 20 complaints
• Door/window: 14 complaints
• Paint/plaster: 7 complaints

The most recent complaint on this building was filed September 11, 2026.

Conditions cited on open violations at this address:

• § 27-2017
• § 27-2005 ADM CODE REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN A UNIFORM COLOR AT CEILING AND ALL WALLS IN THE 2nd ROOM FROM NORTH LOCATED AT
• § 27-2005 ADM CODE REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN A UNIFORM COLOR AT CEILING AND ALL WALLS IN THE KITCHEN LOCATED AT APT 3R, 3rd
• § 27-2005, 2007 ADM CODE FIRE EGRESS DEFECTIVE

The building last changed hands on December 4, 2013 for $700,000, according to recorded deeds.

Brix score: 20/100. View the Building Report on Brix.