3341-3347 18th St, San Francisco, CA 94110
The Inner Mission property at 3341-3347 18th Street is a three-story, 10-unit multi-family residential building constructed in 1907, currently owned by 3345 18th Street Ti LLC. The building underwent significant work in 2017, including major improvements to its fire safety systems, electrical infrastructure, and modifications to common areas and commercial spaces. These improvements included upgrading the fire alarm system, fire suppression system, and electrical systems, as well as constructing new trash room enclosures and stairways.
The building is classified as a Tier 4 soft-story structure, and work has been completed with a Certificate of Final Completion issued. Recent concerns have emerged regarding unauthorized modifications and maintenance issues. In August 2023, complaints were filed about potentially unpermitted plumbing work in both a residential unit and the basement restaurant (Balompie Cafe), with concerns about improper wastewater disposal.
Additional recent issues include a fire alarm violation issued in January 2024, and a history of maintenance concerns from 2016-2017 that were subsequently addressed, including repairs to stairs, windows, and heating systems. The property has maintained active compliance with major systems through various upgrades, including multiple water heater installations, electrical system improvements, and fire safety enhancements over the years. Recent routine inspections in 2022-2023 have noted various maintenance issues in common areas, though most have been resolved. The building has experienced recurring fire safety system inspections, with occasional violations related to maintenance and operations, though these have generally been promptly addressed.
3341-3347 18th St Report Contents
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Building Characteristics
Total units | 10 |
---|---|
Year built | 1907 |
Total area | 8304 sq ft |
Floors | 3 |
Tax Abatements | None |
Building Class | A5 - Apartment 5 to 14 Units |

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Key Building Statistics
Included Addresses
- 3345 18th St, San Francisco CA 94110
- 3347 18th St, San Francisco CA 94110
- 3343 18th St, San Francisco CA 94110
- 3341 18th St, San Francisco CA 94110
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