424-426 Frederick St, San Francisco, CA 94117

The two-unit residential building at 424-426 Frederick Street in the Parnassus/Ashbury Heights neighborhood is a two-story flats and duplex structure built in 1900, currently owned by the Wilcox Family Trust. The property has undergone significant renovations, particularly in 2009, which included major improvements such as a comprehensive kitchen remodel, bathroom updates, electrical rewiring, and window replacements totaling over $100,000 in permitted work. This renovation period also saw the installation of new lighting, smoke detectors, and kitchen appliances, along with plumbing updates including furnace replacement and gas fireplace installation.

More recent improvements include the addition of new windows in living rooms on the second and third floors in 2021, and a sewer/housetrap replacement in 2017. The building's maintenance history shows regular attention to infrastructure, with multiple street space permits issued between 2009-2017 and various electrical and plumbing upgrades documented. The property has experienced some external maintenance challenges in recent years, as evidenced by several 311 calls between 2019 and 2025, including reports of graffiti, sidewalk cleaning issues, and tree-related concerns.

The most concerning recent issues are an open 2023 report of tree roots damaging the sidewalk and an open 2025 case of graffiti on street furniture. These external issues appear to be typical urban maintenance challenges, rather than building-specific problems. Most renovation work has been focused on interior improvements and systems upgrades, suggesting regular maintenance of the building's core infrastructure. The property's significant 2009 renovation work and subsequent periodic updates indicate active ownership and maintenance practices, though some systems installed during that period may now be approaching typical replacement age.