558 21st Ave, San Francisco, CA 94121

The two-story, five-unit apartment building at 558 21st Avenue in the Central Richmond neighborhood, owned by 558 21st Ave LLC, has undergone significant improvements since its construction in 1922. Most notably, in recent years, the property completed a mandatory seismic retrofit as a Tier 3 soft-story building, adding a new fire sprinkler system throughout the ground floor in 2022, and upgrading the fire alarm system to meet current safety standards. The building's infrastructure has been modernized with a 400-amp electrical service upgrade in 2022, and the addition of Unit 6 (previously a 5-unit building) was successfully completed in 2016, including comprehensive plumbing, electrical, and fire safety installations.

Recent plumbing and electrical work for Unit 6 was completed in 2024. Previous building violations from 2002 related to fire safety and smoke detection were all abated by February 2003. The property has maintained an active response to safety and infrastructure requirements, with all recent building permits marked as complete.

Records show regular maintenance and upgrades to individual units, including kitchen and bathroom remodels in Units 1 and 4 in 2011, and structural work such as concrete footing replacement in 2021. While there have been some recent reports of debris and parking violations near the property, these were external issues not directly related to the building's condition or management. The building's fire safety systems have been substantially upgraded over the past several years, including the installation of low-frequency sounders in sleeping areas and monitoring modules for sprinkler systems in 2022 to comply with San Francisco Fire Department requirements.