670 Corbett Ave, San Francisco, CA 94114

The property at 670 Corbett Ave is a two-unit, two-story multi-family residential building located in Twin Peaks, constructed in 1938 and currently owned by Peter W. Knuth. The building's historical records reveal several significant events, with the most pressing concerns being documented in 2012 when two separate complaints were filed regarding potential illegal units, including allegations of unauthorized modifications involving cement steps and multiple unauthorized entrances throughout the building.

An earlier incident in 2011 noted unauthorized construction work involving jackhammering on a covered patio and the removal of a redwood tree. The building underwent electrical system improvements in 2007, including an underground service conversion to a 100-amp, two-meter system, though one permit related to a 150-amp installation expired. Recent activity around the property between 2023-2024 has primarily consisted of municipal service calls, including multiple reports of defaced parking signs that remain open as of January 2024.

The building's fire alarm system has triggered three times, though these incidents were either due to malfunction or unintentional activation, with no civilian injuries reported in any case. The property's maintenance history shows recent attention to street-level issues, with multiple reports of debris, garbage, and other cleanliness matters being addressed through normal city resolution processes. While the building's major structural and safety systems appear to have been stabilized since the 2007 electrical upgrades, the persistence of multiple graffiti and debris incidents in the surrounding area suggests ongoing maintenance challenges.