1820-1822 Filbert St, San Francisco, CA 94123

The two-unit residential building at 1820-1822 Filbert Street in Cow Hollow, owned by Eric R. Mathewson, is a two-story flats and duplex structure built in 1900. The property underwent significant renovations and upgrades between 2005 and 2010, including a major seismic upgrade that began in late 2005, installation of fire sprinklers throughout the building in 2007, complete rewiring of both units with new electrical systems, and comprehensive plumbing work including bathroom and kitchen remodels, laundry facilities, and radiant heating installation.

The renovation period also saw the addition of multiple fireplaces (two in January 2008) and a new air conditioning unit installation. Several building permits from 2010 relate to obtaining final inspections for previously approved work, indicating that much of the construction was completed by this time. While the major renovation work appears to have been properly completed and inspected, there were some procedural issues noted during the renovation period, including a complaint filed in December 2005 regarding foundation work commencing without a valid building permit, though this violation was ultimately abated in July 2012.

The property also experienced some planning activity regarding a proposed one-story addition and rear addition with enclosed porches, which went through various approval stages and ultimately received approval, though earlier appeals were denied. More recently, there have been several routine municipal service calls in the vicinity, primarily related to parking enforcement and street cleaning, with the most recent activity being general cleaning in March 2023. The building's documented history suggests that it has been well-maintained since completing its major renovations, with no significant building code violations or safety concerns reported in recent years.