457-459 21st Ave, San Francisco, CA 94121

The property at 457-459 21st Avenue in the Central Richmond neighborhood is a four-story, multi-family residential building constructed in 1906, currently owned by Lin Henry & Hongmei. The building underwent significant renovation and expansion between 2006 and 2008, including a $750,000 two-story vertical addition, rear extension, and garage construction that converted it from a single-family to a two-unit residence.

During this period, the property received critical safety upgrades including the installation of a comprehensive NFPA 13 sprinkler system with 106 heads ($22,000), exterior fire bell connections, and various plumbing enhancements. The renovation project faced some challenges, including a complaint in January 2008 regarding unsafe scaffolding conditions and debris, though this was promptly addressed within one day, and a height-related concern filed in October 2007 that was resolved within two days. Since the completion of the major renovations, the building's record has been relatively quiet, with no significant building code violations or major safety concerns reported.

The property has undergone regular maintenance and improvements, including electrical upgrades in 2008 for an elevator motor and garage door opener, and various plumbing improvements. The surrounding area has experienced typical urban maintenance issues over the years, as evidenced by multiple 311 calls between 2017 and 2022 reporting street cleaning needs, including instances of graffiti removal, waste cleanup, and hazardous materials removal, all of which were resolved promptly. A building permit from 2008 confirmed the proper address verification for both units, ensuring accurate identification of the property's two distinct housing units.