1631-1633 11th Ave, San Francisco, CA 94122

The property at 1631-1633 11th Avenue in San Francisco's Inner Sunset neighborhood is a two-story, multi-family residential building constructed in 1910, currently owned by Wong Ben Ton & Zhong Mei Qi. The building's history reveals significant concerns about unauthorized modifications and maintenance issues.

Most notably, there has been an ongoing situation regarding an illegal ground floor unit, which triggered multiple complaints and Building Violations in 2008 that remain active, citing serious life safety hazards including an unapproved second means of egress, improper ceiling height, unauthorized wiring and plumbing, lack of smoke detectors, questionable structural modifications, and improper windows and doors. Previous attempts to address this situation included a 2009 permit (which expired) to legalize various ground floor modifications and remove the unauthorized unit, but this work does not appear to have been successfully completed. The building has experienced several maintenance issues over the years, including a 2004 violation for inadequate heating in habitable rooms, documented water damage and deck problems in 2009, and concerns about dilapidated rear stairs.

More recent records from 2024 indicate ongoing plumbing issues, with two sewage backup incidents reported through 311 calls in December 2023 and April 2024. The property has also generated multiple parking enforcement calls between 2021-2024, primarily related to blocked driveways, though these are not directly related to the building's condition. A significant maintenance note from 2021 regarding a damaged street tree suggests attention to exterior maintenance, though this is now under City jurisdiction through the StreetTreeSF program.