689-691 16th Ave, San Francisco, CA 94118

The two-unit residential building at 689-691 16th Avenue in San Francisco's Central Richmond neighborhood is a 2-story structure built in 1921, currently owned by the Yee Trust. The property has undergone several significant changes and faced multiple challenges over its history. Most notably, the building experienced a series of sewer issues between 2021 and 2023, with three recorded sewage backup incidents involving 4-inch vent problems.

In 1999-2000, the ground floor underwent legal modifications to convert a storage room into a full bathroom, though there were earlier complaints about unauthorized unit conversions in both the ground floor and garage areas. The building suffered earthquake-related damage in 1999, including structural issues like cracks and a slanted kitchen floor, which were addressed by early 2000. Recent activity at the property includes multiple 311 calls regarding abandoned vehicles near the address, with the most recent in 2024, though these vehicles were not found upon inspection.

A carbon monoxide detector activation incident was recorded, but no carbon monoxide was detected. While there have been some internal modifications over the years, including attempts to replace kitchen cabinets in 2010 and the installation of aluminum windows in 1987, many of these permits were either cancelled or expired. The building's maintenance history shows active management of water-related infrastructure, though the recurring sewer issues from 2021-2023 suggest ongoing plumbing challenges.