100 Jefferson Street, Brooklyn, NY 11206

100 Jefferson Street is a 3-story, 2-family residential building located in Bushwick and owned by Moses Karpen. Since its construction in 2008, the building has experienced recurring heating and hot water issues, with the most recent complaints in March 2025 (four separate incidents), including three classified as emergencies.

The building experienced a significant heating system failure in February 2022 that affected the entire building, resulting in violations for inadequate heat and hot water supply. Safety concerns were prominent in January 2019, with multiple violations related to carbon monoxide detectors, smoke detectors, and window guards, though these violations were eventually closed. The building's maintenance history reveals several problematic conditions during 2019, including issues with mold, various safety concerns, and unsanitary conditions.

A notable incident involved the illegal use of cellar space, with violations issued for creating unauthorized living spaces with plumbing fixtures, resulting in an active Environmental Control Board violation with a $12,500 penalty. While there have been multiple rodent inspections, including recent inspections in 2024 and 2025 showing no rat activity, prior inspections indicated periodic rodent issues. The building's management has shown some difficulty in allowing inspection access for certain complaints, as evidenced by multiple instances in both 2025 and 2019 where inspectors were unable to gain access to conduct necessary evaluations.