163 19th Ave, San Francisco, CA 94121

The two-unit residential building at 163 19th Avenue, owned by Ronald Wong and Beverly C Cho, is a two-story flats and duplex structure built in 1910 in the Lake neighborhood near The Presidio.

The building's records show several maintenance and infrastructure improvements from the early 1990s, including a roofing project and siding installation to the rear of the building in 1993, and structural reinforcement work involving anchor bolt installation in 1991, all of which are now marked as expired permits. The property has experienced recurring sewer issues in recent years, with two separate sewage backup incidents reported in January and May of 2020 involving 4-inch vent problems, though both were resolved by PUC Sewer Operations.

Other incidents on record include non-structural issues such as graffiti on the building in 2013, which was addressed by the Department of Public Works, and two recent street-level service calls in 2023 involving park patrol and general cleaning, both of which were resolved through standard municipal procedures. While the building has undergone necessary maintenance over the years, it's worth noting the concentration of sewer-related incidents in 2020, which required urgent remediation efforts.