109-111 4th Ave, San Francisco, CA 94118

The two-unit residential building at 109-111 4th Ave, owned by Lau Family Trust, is a two-story flats and duplex structure built in 1907 in the Lake-The Presidio neighborhood. The property has undergone several significant improvements over the years, most notably a bathroom remodel in 2009 at Unit 111 that included the installation of a 1/4 round standing shower, toilet relocation, and electrical updates, as well as sewer line and house trap replacements completed in 2008.

Both buildings experienced a carbon monoxide detector activation incident, though no actual CO was present and there were no civilian injuries reported. The property currently faces several parking-related issues, with multiple 311 calls in late 2024 regarding unsafe parking and damaged traffic signs, though these are primarily external matters affecting the street rather than the building itself.

A concerning historical incident was documented regarding illegal activities involving commercial farm operations, including chickens and reptiles, though this was marked as abated. While there were some infrastructure improvements made in the past, including bathroom and plumbing upgrades, the building's permit history shows no recent major renovations or repairs. The property has also experienced recurring issues with illegal postings, with an open case as of December 2024, and multiple parking enforcement calls were required in 2024 to address driveway blocking situations.