170-172 12th Ave, San Francisco, CA 94118

The two-unit residential building at 170-172 12th Avenue in the Lake - Presidio neighborhood is a two-story flats and duplex structure owned by Robert L. Wong and Henry Trus, constructed in 1911.

The building's maintenance history shows several significant improvements over the years, including a complete water main line replacement in 2010 and the installation of 25 vinyl windows in 2001, which were fitted into existing frames without modifying their size or location. The roofing has received attention on three occasions, with work completed in 1989 and 2004, the latter costing $6,500.

More recently, two service requests have been documented: a routine Rent Board housing inventory fee inquiry in October 2023, which was resolved through a phone call and subsequent paperwork, and a color curb request in August 2015 that was transferred to the appropriate program for processing. The building's permit history indicates regular maintenance and updating of essential systems, though it's worth noting that all listed building permits have either expired or been completed, suggesting these were one-time improvements rather than ongoing concerns.