6402 24th Avenue, Brooklyn, NY 11204

6402 24th Avenue is a 39-unit, 4-story New Law Tenement built in 1928 and currently owned by Harry Koslowski. The building has experienced recurring heating and hot water issues in recent months, with the most recent complaint (5/13/2025) still open as of May 2025. Between April and May 2025, there were multiple emergency complaints and inspections related to heat/hot water and water supply problems, affecting both individual apartments and the entire building. In late 2024, several violations were documented in apartment C2, including mold, water leak issues, and problems with doors and plaster surfaces.

Apartment C3 had documented pest control issues in 2024, with violations for mouse and roach infestations, though these were certified as resolved by November 2024. The building's maintenance history shows ongoing mechanical issues, particularly with the boiler system. Two separate boiler-related complaints were recorded in 2019 (resolved) and December 2023, along with an associated ECB violation for defective burner conditions that was resolved with a penalty in 2023. Building-wide heating system issues appear to be a recurring problem, with numerous tenant complaints and HPD inspections showing difficulties in gaining access for inspections and verifying repairs.

While the building has maintained a clean record regarding bedbug infestations over the past six years (2019-2025), there have been multiple rodent control inspections showing rat activity in 2022, though the building passed inspections in earlier years (2015, 2018). Several recent HPD inspections (2025) faced challenges in gaining access to units for verification of reported issues, including complaints about the bell/buzzer/intercom system and various maintenance problems. The building has a history of housing maintenance code violations that were closed out, including issues with interior maintenance such as plaster surfaces, painting requirements, and door functionality. While many past violations have been resolved, the pattern of heat/hot water problems and difficulty with unit access for inspections suggests ongoing challenges with maintenance communication and building systems. The property has shown compliance with bedbug reporting requirements, consistently reporting zero infested or re-infested units from 2019 through 2025.