101-103 Masonic Ave, San Francisco, CA 94118

The two-unit residential building at 101-103 Masonic Ave in the Lone Mountain neighborhood is a two-story flats and duplex structure built in 1958 and currently owned by the Lam Family Trust. The building's maintenance history shows several significant infrastructure upgrades, including sewer lateral replacements in 2014 (40 feet) and 2013 (16 feet with house trap), indicating attention to critical plumbing systems.

Earlier improvements included window installations in 1988 and 1985, and reroofing work in 1999, though these permits have since expired. More recent building activity has been concentrated in the street space, with two permits issued in 2009 and 2017, each costing $1.

The property has experienced a series of street-related issues in 2024, with multiple 311 calls regarding garbage and debris, illegal postings, and graffiti on public property, though these were primarily external to the building itself. The building's fire alarm system has experienced several unintentional activations, all of which occurred without any associated injuries or actual fires. These incidents, along with the 2024 street maintenance issues, suggest a building that is generally well-maintained from a structural standpoint, though experiencing some environmental challenges related to its urban location and building system testing.