819 Crescent Ave, San Francisco, CA 94110

819 Crescent Avenue in Bernal Heights is a one-story, two-unit multi-family residential building constructed in 1950, currently owned by the Mateo Living Trust. The property has a history of unauthorized modifications and safety concerns, with the most recent issues occurring in 2023, including multiple active complaints regarding an illegal unit in the garage (filed September and October 2023) with reports of no heating, no hot water, and unauthorized electrical work.

The building has undergone several controversial modifications over the years, including attempts to legalize basement rooms (1998), unit removal (1996), and various unpermitted work claims, such as unauthorized painting work in 2018 raising lead paint concerns. Historical records show recurring issues with illegal units and unpermitted modifications dating back to the 1990s, including multiple complaints about unauthorized in-law units and illegal basement modifications.

The property has also experienced some fire safety inspections, with incidents of combustible materials reported in 2007 (resolved) and sprinkler concerns in 2016 (no merit). More recent maintenance issues were noted in October 2024, including a sewage backup from the side sewer vent, and there have been multiple reports of abandoned vehicles and illegal parking issues around the property. While some historical complaints have been resolved, the building continues to show patterns of non-compliance with building codes and safety standards, particularly regarding unauthorized living spaces and inadequate heating and hot water systems.