479-483 20th Ave, San Francisco, CA 94121

The 2-unit multi-family residential building at 479-483 20th Avenue, owned by Tran Hoang David, has undergone several significant renovations and faced multiple compliance issues since 2009. Built in 1914, the two-story structure has seen substantial improvements to its safety systems, including the installation of a comprehensive fire sprinkler system in 2019 ($14,000), a new sprinkler monitoring system in 2022 ($5,200), and related gas line modifications completed in 2024.

The building underwent major exterior work in 2019, including dry rot repairs ($9,250) and stucco replacement ($13,500), both focusing on maintaining the building's original architectural elements. Of particular concern is the history of unauthorized modifications and compliance issues, most notably a 2017 complaint regarding the ground floor conversion to habitable space, including concerns about at least three illegal in-law units, which remains marked as active.

The building's plumbing infrastructure was significantly upgraded, with sewer line replacement work completed in 2022, while interior improvements included kitchen and bathroom remodels in multiple phases (2017-2019) totaling over $75,000. Recent maintenance issues have primarily involved exterior concerns like paint quality and parking-related complaints, with multiple citations issued for sidewalk parking violations between 2022-2024, though these are external to the building's structure and systems. An active tree maintenance issue was reported in October 2024, but this falls under municipal jurisdiction rather than building management.