159 20th Ave, San Francisco, CA 94121

The two-unit residential building at 159 20th Avenue in the Lake-Presidio neighborhood is a two-story flats and duplex structure built in 1910, currently owned by Joe C. Chen. The property has undergone several significant infrastructure improvements over the past two decades, including a comprehensive window and door replacement project in 2001 valued at $24,000, sewer repair in 2011, and multiple water service upgrades in 2011.

More recently, in 2011, both retaining walls were addressed, with one being replaced and a new one added at a cost of $5,000. The building's maintenance history shows regular attention to major systems, though some permits from 2011 have expired without documented completion. The property has experienced recurring issues with street cleaning and waste management between 2012 and 2013, with multiple reports of garbage cans being left out continuously, though these were resolved through official notices.

There have been several reports of abandoned vehicles in the surrounding area between 2013 and 2024, all of which were addressed by the Department of Parking and Traffic, with most vehicles being gone upon inspection. The most recent activity on record is from October 2024, regarding an abandoned vehicle complaint that was resolved when the vehicle was no longer present. The building's permit history indicates regular maintenance and improvements, though the status of some plumbing work from 2011 is listed as expired rather than completed in the current records.