635-637 4th Ave, San Francisco, CA 94118

The property at 635-637 4th Avenue is a three-story, two-unit multi-family residential building constructed in 1906, currently owned by the Tann Family Trust 2014. The most significant recent work occurred in 2014-2015 when the building underwent a substantial renovation estimated at $480,000.

This comprehensive project included relocating a second unit to the ground floor, garage modifications, window and door upgrades, deck additions, and the installation of skylights. The building received extensive system upgrades during this period, including complete rewiring with a new 200-amp service, plumbing renovations featuring two new kitchens and bathrooms, installation of two new furnaces, and the addition of modern amenities such as smoke detectors and a direct vent fireplace. Historical records show earlier maintenance work from 1997, including termite damage repairs and reroofing.

Since the major renovation, the building's maintenance has primarily involved external factors, with several 311 calls regarding the property's surroundings, including reports of overgrown trees (most recently in 2024), illegal parking incidents, and abandoned vehicles in the vicinity. A tree maintenance issue reported in 2021 indicated that while there was no immediate safety concern, the city's StreetTreeSF program would address trees according to a prioritized maintenance schedule. The property underwent an informal project review meeting in 2014 to discuss proposed modifications, including a rear yard deck and portion of the building within the required setback, suggesting that some design adjustments were considered during the renovation process.