525 West 133rd Street, Manhattan, NY 10027

The 32-unit, 8-story apartment building at 525 West 133rd Street in Harlem, owned by Jack Kornblum, has experienced several notable issues since its construction in 2008. Most concerning is an active Department of Buildings violation from February 2023 regarding the failure to file the FISP Cycle 9B technical report, which remains unresolved.

The building has also accumulated a significant accumulation of rat activity throughout 2024, with multiple inspections in the first half of 2025 showing either active infestation or the need for bait application. While the property has maintained a clean record for bedbug infestations over the past several reporting periods (2021-2024), there were two emergency plumbing complaints related to basin/sink issues in January 2023 that could not be inspected by HPD due to access issues.

The building's maintenance history shows some regulatory compliance challenges, including an Environmental Control Board violation from April 2024 regarding the failure to submit an acceptable required Cycle 8B and 9B report on exterior wall conditions, with a penalty of $6,250 imposed. Prior to these issues, the building had maintained a stable environment with zero reported bedbug infestations from 2019 to 2024, and the most recent rodent inspections in mid-2025 passed without any noted violations. It's worth noting that the building was constructed under the HEREAFTER ERECTED CLASS A classification, which typically indicates a new, properly permitted construction.