578 6th Ave, San Francisco, CA 94118

The two-unit residential building at 578 6th Avenue in San Francisco's Inner Richmond neighborhood, owned by Wu Hai Yang and Chen Sally Xi, has a documented history of maintenance and repairs dating back to 1997. The two-story flats and duplex structure, which was built in 1905, has undergone several important repairs to address safety and maintenance concerns.

Most recently, in early 2018, the property underwent a significant infrastructure upgrade with the replacement of underground water service lines, installing new 1-inch copper pipes. Prior to this, in 2017, the building received attention to its rear access with repairs to the back stairway, though this work was limited to less than 50% replacement and did not involve any structural modifications or front building work.

The building's maintenance history includes earlier efforts to address structural issues, including repairs to dry rot in the back porch and stairs in 1997, along with a withdrawn permit application from the same year that proposed converting storage space into a ma suite with wet bar, though this work was never executed. The consistent attention to critical areas such as water service infrastructure and stair safety suggests ongoing maintenance efforts by the property ownership, though some historical issues like dry rot appear to have recurred over the years.