562-564 20th Ave, San Francisco, CA 94121

The property at 562-564 20th Avenue in San Francisco's Central Richmond district is a two-unit, two-story multi-family residential building constructed in 1920 and currently owned by Douglas N. Hong. The building has undergone several significant improvements in recent years, including the installation of solar panels (2.28 kW system in 2017), an electrical upgrade to 200amp service (2015), and two separate solar PV installations in 2014-2017.

More recent maintenance work includes a substantial reroofing project completed in 2022 costing $28,000, though there was also a notable soil stabilization geogrouting project conducted in March 2022 in response to excavation work at a neighboring property. The building has experienced several maintenance and infrastructure issues over the years, with patterns suggesting periodic sewer system challenges. Most recently, in January 2024 and December 2015, there were reports of sewer backups involving the 4-inch sewer vent system.

The property has also undergone various exterior maintenance work, including stucco replacement (2001) and sidewalk repairs. While the building has had several interactions with city services, most issues have been resolved promptly. Recent incidents include a 2023 parking violation and a 2022 building inspection request, though these were not directly related to the building's structural or maintenance conditions. The property's historical records show proper maintenance of essential systems, with the owner demonstrating proactive investment in solar energy infrastructure and building upgrades over the past decade.