6217-6219 California St, San Francisco, CA 94121

The two-unit residential building at 6217-6219 California Street in San Francisco's Central Richmond neighborhood is a two-story flats and duplex structure built in 1909, currently owned by Connie Y Ng and Almen Kwo. The property has undergone several significant infrastructure improvements over the years, with the most recent being a complete sewer pipe replacement in May 2018 and earlier work including an electrical upgrade to 150-amp service completed in 2009.

The building previously experienced multiple sewer-related issues between 2015 and 2018, with seven documented sewage backup incidents through PUC Sewer Operations, though these appear to have been resolved through proper attention to the system. Other notable improvements include a reroofing project from 2005 (now expired) and the installation of fourteen aluminum windows in 1984. The property's maintenance history shows regular attention to infrastructure needs, though some recent surface issues have been documented through 311 calls, including instances of glass hazards (2021), an overflowing city garbage can (2020), and sidewalk parking violations (2023).

Of particular note is the building's age and corresponding plumbing history; while the recent sewer pipe replacement in 2018 represents a significant upgrade, the previous pattern of sewage backup incidents suggests this system required particular attention. The building's overall permit and maintenance history indicates a pattern of addressing major systems (electrical, plumbing, roofing) as needed, though some permits are now inactive or expired. The property appears to have experienced typical urban maintenance challenges associated with its location, particularly concerning street-level issues that have been addressed through city services.