545-547 26th Ave, San Francisco, CA 94121

The two-unit residential building at 545-547 26th Avenue in San Francisco's Central Richmond neighborhood is a 2-story flats and duplex structure built in 1923, currently owned by Wang Calvinn S. The property underwent significant renovations in 2011, including a substantial horizontal addition valued at $128,000 that added multiple rooms and bathrooms, followed by voluntary seismic upgrades costing $35,000 that included window and door modifications. The building's systems were comprehensively updated in late 2011, with complete rewiring, a 200-amp service upgrade, bathroom remodels, and installation of two new furnaces.

More recently, the building has experienced several maintenance issues, particularly with its sewer system, with documented sewage backups in 2015, 2016, 2021, and a missing side sewer vent cover in 2023. There remains one active code enforcement complaint from 2012 regarding a potentially abandoned building status. Additional historical records show various service calls related to graffiti, noise, and illegal parking, though these do not indicate structural or safety concerns.

The building's permit history shows proper documentation of major improvements and systems upgrades, with no expired permits from the modernization period. Two minor building complaints were filed in 2012 - one regarding a neighboring property's staircase construction near a fire station and another about the building's vacant status - though the former was abated in 2014. The most recent building-related issues have primarily involved infrastructure maintenance, particularly the sewer system, which has required multiple repairs and service calls over the years. The property also experienced two detector activations with no fire or injuries recorded, and one public service assistance call, all indicating responsive management of safety systems.