1643 20th Ave, San Francisco, CA 94122

The two-unit multi-family residential building at 1643 20th Avenue in San Francisco's Central Sunset neighborhood has experienced several noteworthy events since its construction in 1924. Most recently, in October 2023, a sleeping area requirement violation was issued, marking the second such infraction related to sleeping area requirements in recent years, following a similar violation in April 2024.

The property has a documented history of fire safety concerns, including multiple fire code violations in August 2020, a roof access issue in April 2016 (which was corrected), and alarm system problems in October 2012 (also corrected). Building infrastructure has experienced recurring challenges, particularly with the sewer system, with three documented sewage backup incidents between 2021-2022, including incidents in March 2022 and April 2021 involving 4-inch sewer vents. The property has undergone some permitted modifications over the years, including an attempt to add a non-habitable garden room in 2003 (which was ultimately cancelled) and the installation of interior walls in 1985 (completed).

Recent municipal service calls indicate ongoing maintenance needs in the vicinity, including tree root damage to sidewalks (reported August 2024), while regular enforcement actions have been necessary for various issues such as illegal parking (three incidents in 2021) and waste management concerns (including toter management issues in 2022). Historical records also show past concerns with building amenities, including a temporary elevator outage in 2008. While some past violations and complaints have been resolved, the recurring nature of certain issues, particularly regarding fire safety requirements and sewer system problems, may warrant attention.