555-557 20th Ave, San Francisco, CA 94121

The two-unit residential building at 555-557 20th Avenue in San Francisco's Central Richmond neighborhood is a 2-story flats and duplex structure built in 1918, currently owned by William York Lai Gee. The property underwent significant renovation work in 2006-2008, including a major $185,000 remodeling project of the rear portion of the building that added new living spaces across multiple floors, followed by revisions in late 2008 to modify interior stair configurations and footings.

This phase of work included comprehensive upgrades to electrical systems with a new 200-amp service installation, new plumbing for two kitchens and four bathrooms, and the installation of numerous modern amenities such as smoke detectors, appliances, and electrical fixtures. Earlier maintenance records show attention to basic upkeep matters, including stucco replacement in 1990, window sealing and dry rot repairs in 2004, and reroofing work in 1995. More recently, there have been some neighborhood-related issues noted, including a 2024 complaint about possible sidewalk encroachment and a 2020 noise complaint regarding nearby construction activities.

A hazardous materials incident involving liquid substances was reported and resolved in March 2023. The property obtained a rear yard variance approval, indicating compliance with necessary planning requirements. While the building's documented history shows regular maintenance and significant modernization work, the most pressing recent issue appears to be the potential sidewalk encroachment noted in 2024, though this complaint is currently marked as not active.