223-225 18th Ave, San Francisco, CA 94121

This two-unit multi-family residential building, located at 223-225 18th Avenue in San Francisco's Central Richmond neighborhood, is a two-story flats and duplex structure that was built in 1915 and is currently owned by the Jue Yet Ngor Woo 1991 Trust. The building's maintenance and improvement history shows relatively minimal activity over the decades, with three significant permit records between 1987 and 1989, including a kitchen remodeling project completed in 1988 and a reroofing project from 1989 that has since expired.

More recently, the property underwent substantial HVAC upgrades in July 2022, with the installation of a new tankless water heater and the replacement of two existing furnaces along with ductwork modifications. These improvements suggest a significant modernization of the building's systems, particularly with the transition to tankless water heating technology.

The building's permit history shows proper maintenance of essential systems over time, though it should be noted that the earlier 1989 reroofing permit is listed as expired, while the more recent plumbing permits have all been completed successfully. The 2022 HVAC updates, which included both furnace replacement and ductwork modifications, represent the most significant recent improvements to the building's infrastructure.