1233-1235 Union St, San Francisco, CA 94109
The property at 1233-1235 Union Street is a two-unit, two-story multi-family residential building located in the Russian Hill neighborhood. Built in 1907 and owned by John & Stephanie Pasini, this flats/duplex building has undergone substantial renovations and improvements over the past several years. The most significant recent structural work occurred in early 2022 with the installation of a steel girder in the garage, replacing an existing post with new footings ($25,000).
In 2020, the building underwent extensive improvements including the complete renovation of multiple bathrooms, installation of new laundry facilities, kitchen updates, and modernization of heating systems with new furnaces and ductwork ($45,776). Additional improvements included window retrofitting, roofing replacement, and basement renovations creating new living spaces and an exercise room with full bath. The building's mechanical systems have been thoroughly upgraded, including electrical improvements with new lighting installations and subpanels, and comprehensive plumbing work including new bathrooms, kitchen facilities, and a tankless water heater system.
Historical records from 2002 show previous building violations regarding stair repairs and deck maintenance, though these were abated by March 2005. The property has experienced multiple instances of driveway blocking issues, with the most recent complaints occurring throughout 2023-2024, all of which were resolved through parking enforcement. A recorded fire incident involved a malfunctioning alarm system with no injuries reported. The building's maintenance and improvement history shows significant investment in both structural integrity and resident comfort, with particular attention to modernizing systems and maintaining building codes.
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Building Characteristics
Total units | 2 |
---|---|
Year built | 1907 |
Total area | 2272 sq ft |
Floors | 2 |
Tax Abatements | None |
Building Class | F - Flats & Duplex |

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Included Addresses
- 1235 Union St, San Francisco CA 94109
- 1233 Union St, San Francisco CA 94109
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