3442-3446 21st St, San Francisco, CA 94110

Located in the Eureka Valley/Dolores Heights neighborhood, this 1928 two-unit multi-family residential building at 3442-3446 21st Street has undergone significant improvements in recent years, with particular attention to safety systems and modernization. Most notably, in 2023-2024, comprehensive sprinkler system upgrades were completed, including the installation of a new waterflow supervisory system with modern monitoring capabilities and control panel.

The building has also received substantial electrical and plumbing upgrades, with recent permits showing complete rewiring of both units (including LED lighting, dedicated circuits, and new services), as well as plumbing improvements including bathroom, kitchen, and laundry renovations along with the installation of a multi-zone heat pump system. The property has seen extensive renovations between 2019 and 2024, including the legalization of additional living space, new roof deck installation, and modernization of systems including solar PV installation in 2020. Two complaints were filed in 2020 regarding construction impacts on neighboring properties and work status, though both cases were marked as not active.

A noteworthy historical context involves an attempt to legalize a third unit in the early 2020s, which was ultimately disapproved by the Planning Department. More recently, there have been multiple reports of parking enforcement issues related to driveway blocking, with several citations issued between February and September 2024. The building's current systems and infrastructure appear to be well-maintained and regularly updated, with no recorded fire incidents beyond a false alarm in 2020.