1725-1727 Mason St, San Francisco, CA 94133

This two-unit residential building located at 1725-1727 Mason Street in Russian Hill is a 2-story flats and duplex structure built in 1922 and currently owned by Susan Ferer Karasoff. The property has undergone several significant improvements over the past two decades, with the most substantial renovation occurring in 2013, when comprehensive updates were made to both units' kitchens and bathrooms, including the reconfiguration of living spaces, reinforcement of stair structures, waterproofing improvements, and soundproofing enhancements at a cost of $40,000.

This renovation also included the installation of new electrical systems, with updated service panels, receptacles, and lighting throughout both units. The building has seen consistent maintenance and upgrades, including a 2014 sewer and house trap repair in the sidewalk area, a 2010 installation of a high-efficiency furnace and associated ductwork in the garage (costing $25,000), and various electrical system improvements.

Earlier improvements included a 2009-2010 project to complete previously approved work, rear deck construction in 2008, and multiple plumbing upgrades in 2013, including the installation of new fixtures throughout both units. The property's infrastructure appears to be well-maintained, with no recorded safety issues or violations, though there have been several cancelled or expired permits, including a 2013 fireplace installation permit and a 2013 dedicated circuit for an instant hot water heater. Two street space permits were issued in 2010 and 2013, each costing $1.00.