641 St Marks Avenue, Brooklyn

108 open HPD violations at this address, 37 of them class C — the immediately hazardous tier — on a 30-unit walk-up apartment building in Brooklyn.

641 St Marks Avenue is a 30-unit building in Brooklyn, New York City (BBL 3012190069). This building is associated with Prospect Heights 637-641 Realty LLC. Brix tracks 108 open HPD violations for this property, along with inspection history, DOB filings, tenant complaints, and rent stabilization status.

Built in 1900, 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 466 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: 246 complaints
• Unsanitary Condition: 54 complaints
• Electric: 39 complaints
• Water Leak: 34 complaints

The most recent complaint on this building was filed September 17, 2026.

Conditions cited on open violations at this address:

• § 27-2037, 2038 HMC: PROVIDE A SAFE AND ADEQUATE SUPPLY OF ELECTRIC SERVICE TO THE FIXTURES AT ALL ELECTRICAL FIXTURES AT PUBLIC HALL
• § 27-2005 HMC: PROPERLY REPAIR OR REPLACE THE BROKEN OR DEFECTIVE SPRING BALENCE AT LOWER WINDOW SASH AT THE 2ND WINDOW FROM EAST AT SOUTH IN THE 1st ROOM FROM
• § 27-2031 ADM CODE PROVIDE HOT WATER AT ALL HOT WATER FIXTURES IN THE ENTIRE APARTMENT LOCATED AT APT 4D, 4th STORY, 2nd APARTMENT FROM NORTH AT EAST , SECTION
• § 27-2033 ADM CODE PROVIDE READY ACCESS TO BUILDINGS HEATING SYSTEM LOCKED DOOR AT BASEMENT AT BOILER ROOM

The building last changed hands on July 7, 2016 for $14,200,000, according to recorded deeds.

Brix score: 0/100. View the Building Report on Brix.

See every NYC building owned by Prospect Heights 637-641 Realty LLC on the landlord portfolio page.