2371 18th Ave, San Francisco, CA 94116

The two-unit residential building at 2371 18th Avenue in San Francisco's Inner Parkside neighborhood is a two-story flats and duplex structure built in 1912, currently owned by David Y. Wong and Anita C. Wong-Lo.

The property has undergone several significant improvements over the years, with the most recent being a sewer replacement completed in January 2025, following two sewage back-up discharge incidents from the side sewer vent in late 2024 and early 2025 that required attention from PUC Sewer Operations. The building has seen substantial maintenance and upgrades in recent years, including a complete siding renovation in 2018 costing $8,000 that involved replacing approximately 3,800 square feet of siding on all sides of the building, using both wood and James Hardie materials. A notable sustainability upgrade was completed in December 2018 with the installation of a solar power system featuring 16 photovoltaic modules totaling 5.28 kW.

Historical records show some significant construction activity in the early 1990s, including completed permits for horizontal and vertical additions in 1991, and sprinkler plans for installation of 70 heads. Two other related permits from that period, regarding roof details and fourth-floor framing removal, were either completed or expired. The building's maintenance history suggests regular upkeep, though the recent sewer issues indicate ongoing infrastructure challenges.