21 Buena Vista Ave, San Francisco, CA 94117

21 Buena Vista Avenue is a three-story, two-unit multi-family residential building located in Buena Vista Park, built in 1900 and currently owned by Buenavis LLC. The building has undergone significant seismic and structural improvements in recent years, including voluntary strengthening work completed in 2021 at a cost of $35,000, following earlier enhancements in 2017 and 2005 that focused on foundation bolting and seismic reinforcement. A 2011 violation regarding a missing house trap and fresh air vent remains active, along with more recent complaints about sewer system issues involving multiple properties including 21 Buena Vista.

The building's systems have seen various upgrades, including plumbing work in 2014 to address a compliance issue, electrical improvements in 2004-2019, and various structural repairs such as rear egress stair repairs in 2019. Historically, the property has experienced several regulatory and compliance challenges, particularly in the early 2000s, including stop work orders and permit suspensions related to unauthorized modifications. The building underwent a significant change of use in 2005, converting from a single-family dwelling with 14 guestrooms to its current two-unit configuration. More recent issues have primarily centered around the building's plumbing system, with multiple complaints about sewer problems between 2002 and 2011, and more recently, concerns about inadequate sewer sizing.

The property's fire safety record shows several alarm system activations, but none resulted in injuries or significant damage, and primarily these incidents were related to system malfunctions or false alarms. The building's recent history (2021-present) shows active management and maintenance efforts, particularly regarding structural integrity and seismic safety, though some infrastructure issues (notably plumbing) remain unresolved. Recent complaints from 2024 indicate ongoing concerns about parking enforcement in the area, with multiple citations issued. The property maintains its residential character, though its historical evolution from a hotel/guestroom configuration to a two-unit building reflects significant changes in use patterns over the years.