124 Lyon St, San Francisco, CA 94117

The 5-unit, 4-story multi-family residential building at 124 Lyon Street in Haight Ashbury, owned by the Ong & Tan Family Trust, has undergone several significant changes since its construction in 1890. Most recently, in July 2023, substantial work began to create an ADU within the existing building envelope, followed by a complete rewiring of a 3-bedroom apartment scheduled for November 2024. The property has a complex history with group housing conversions, including a 2022 attempt to revert from group home use back to a two-unit building, and previous group housing approvals for 10 occupants in an RH-3 district.

Several building safety issues were addressed between 2019 and 2011, including a fresh air inlet problem and a lapsed seismic upgrade permit that led to violation proceedings, though these were ultimately closed in 2014. The building's infrastructure has received attention over the years, with electrical service upgrades including conversions to underground service in 2007 and 2004, and various structural improvements such as plywood shear walls installation in 2006. Historical records show earlier work including reroofing in 2000 and a horizontal addition in 1995.

Recent 311 calls from January 2025 indicate ongoing neighborhood challenges, including reports of graffiti and encampments near the property, though these issues are external to the building itself. The property underwent a tenant buyout in September 2024, involving 4 tenants with a payment of $17,815. The building's systems have required various permits over the years, with some permits either cancelled or expired, though most major improvements have been successfully completed.