City inspectors were last at this 6-unit walk-up apartment building on May 5, 2026, and the resulting violation remains open.
638 Humboldt Street is a 6-unit building in Brooklyn, New York City (BBL 3026860059). This building is associated with Kostrzewski Revocable Trust. 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 16 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:
The most recent complaint on this building was filed April 14, 2026.
Conditions cited on open violations at this address:
The building last changed hands on February 5, 2026 for $560,000, according to recorded deeds.
Brix score: 3/100. View the Building Report on Brix.
See every NYC building owned by Kostrzewski Revocable Trust on the landlord portfolio page.
Part of Greenpoint — see violations, complaints, and landlord activity across the whole neighborhood.
Other buildings in 11222:
Browse every NYC neighborhood or the landlord directory on Brix.
Unit 1L at 638 Humboldt Street has 5 open violations.
Unit 1R at 638 Humboldt Street has 1 open violation.
Own or manage this building? Monitor it or correct the record.