3639-3641 20th St, San Francisco, CA 94110

The property at 3639-3641 20th Street, a 2-unit multi-family residential building constructed in 1912, has undergone significant renovations and safety improvements over the past several years, with the most substantial work occurring between 2017-2020. The building received comprehensive updates including complete rewiring of both units with new subpanels, installation of a fire sprinkler system throughout (with 61 sprinkler heads), and major interior reconfigurations.

The 2017 renovation work valued at $530,000 included the removal and relocation of bedrooms, structural upgrades, bathroom reconfigurations, and installation of a new roof deck. Subsequent improvements from 2018-2019 involved plumbing upgrades for two kitchens and multiple bathrooms, including radiant heat system installations, though some permits from this period show as expired. More recent work has focused on system upgrades and maintenance, including the installation of a sprinkler monitoring system in 2020 and various plumbing improvements.

The building has experienced some maintenance issues, particularly in 2023, with two reported sewage backup incidents through a 4-inch vent, though these were resolved according to records. The property has also seen several street space permits issued between 2017-2020, and while there was one building-related complaint in April 2020 regarding work during shelter-in-place orders, this complaint is currently listed as not active. Recent 311 calls (2023-2024) have primarily concerned street-related issues such as hazardous materials and parking violations, rather than building-specific problems, suggesting that while the property has required substantial work in the past, it is currently maintaining regulatory compliance with no recorded building code violations.