3878-3880 21st St, San Francisco, CA 94114

The property at 3878-3880 21st Street, a two-story multi-family residential building constructed in 1909, is currently owned by 21st & Castro LLC and consists of three units. The building has undergone significant recent improvements, with major renovation work permitted in August 2023 involving kitchen remodels and bathroom additions on multiple floors, valued at $325,000.

Furthermore, a new ADU (Accessory Dwelling Unit) with fire sprinkler installation is currently in progress as of November 2024, with associated plumbing and electrical work also permitted in December 2024, representing a substantial investment of over $150,000. The property's history shows several transformation attempts between commercial and residential uses, including a 2014 permit for conversion to R-3 SFR with additional amenities, and earlier proposals to convert units and add roof decks in 2012. Notably, a major redevelopment plan was approved to merge two units into one single-family dwelling, with additional variances granted for construction within required setbacks.

Recent infrastructure improvements include a 400 AMP service upgrade. The area has experienced typical urban issues as evidenced by 311 calls in late 2024, including reports of graffiti, illegal postings, and tree maintenance needs, though many of these have been promptly resolved. The building's recent renovations and improvements suggest ongoing investment in maintaining and upgrading the property, though prospective tenants should be aware of the ongoing construction activities as of late 2024.