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912-916 Union St

Russian Hill, SF 94133 0099004B 4 units · 3 fl · 1917

This building has a higher-than-average number of open problems nearby. Few open issues; problems get fixed quickly. A reasonable bet for a smooth tenancy.

NOVs (7y) vs. neighborhood
Compared to a typical building in Russian Hill
At or below average
avg 1.9
0
FewerMore

This building has 0 novs (7y), at or below the Russian Hill average of 1.9.

Rent & eviction protection

Is 912-916 Union St rent-controlled?

San Francisco's Rent Ordinance caps rent increases and provides eviction protection for most residential units built before 1979 with 2+ units. Here's how this building scores.

Built before 1979
Built 1917
2 or more units
4 units
Property type
Multi-Family Residential
Zoning
RM2
Likely rent-controlled. Building age and unit count suggest this property falls under San Francisco's Rent Ordinance.

Based on SF Assessor records. Not legal advice — confirm with the SF Rent Board.

Building characteristics
Units4
Floors3
Year built1917
Total area4,995 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0099004B
Ownership

Registered owner per SF Assessor-Recorder (secured roll).

Owner name
Mazzaferri Fosse Properties
Mailing address
Mazzaferri-fosse Mary Sole 97 Dominican Dr San Rafael CA 94901
Last sale
020216

Landlord portfolio

Other SF properties this owner holds, with risk grades for each.

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Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

912 Union St, San Francisco, CA 94133
914 Union St, San Francisco, CA 94133
916 Union St, San Francisco, CA 94133
Augrented Insights
Initial analysis

The three-story, four-unit multi-family residential building at 912-916 Union Street in Russian Hill, owned by Mazzaferri Fosse Properties, was constructed in 1917 and has undergone several significant maintenance and renovation projects over the years. Most notably, in 2015, the property underwent multiple improvements including a bathroom remodel, installation of a new water heater, and electrical work, though there were complaints about some of this work being done without proper permits. The building has experienced periodic maintenance issues, including a 2012 complaint regarding weatherproofing of the siding and concerns about lead paint, which was subsequently addressed. A routine housing inspection in 2005 revealed several safety concerns including missing fire extinguishers, incomplete smoke detector installation, and various electrical issues, though these violations were abated by June 2005.

The property has maintained active upkeep, as evidenced by the 2015 renovation work, which included comprehensive updates to multiple units despite some permitting irregularities that prompted inspections. More recent years have seen routine urban issues common to the neighborhood, such as parking-related incidents and occasional maintenance matters like graffiti, though these do not directly relate to building conditions. The building's permit history shows regular maintenance work, including a completed bathroom remodel in 2015 and a previously expired reroofing permit from 2002, suggesting ongoing attention to building maintenance requirements.

AI-generated · may contain errors · check the source data tables below

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Risk rating

How 912-916 Union St's risk score is calculated

We trained a model on 7 years of SF DBI inspection data — notice of violation filings, complaint history, and owner track records. It estimates the probability that DBI inspectors will issue a Notice of Violation at this address in the next 12 months. Lower % = safer.

What the score means for you

Grade A–B — Low risk

DBI rarely finds violations here. Strong maintenance history and a clean complaint record.

Grade C — Moderate risk

Some past violations or complaints on record. Worth asking the landlord about any open issues before signing.

Grade D–F — High risk

Elevated violation and complaint history. DBI has found issues here before and is statistically likely to again.

Neighborhood percentile
67th percentile

Out of 1133 buildings in this neighborhood, 374 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
82%
No DBI
violation
18%
DBI violation
likely
Model explanation

What's driving this score

The three data points that most influenced this building's risk rating — ranked by the weight the model placed on each one.

Number of units

The number of units affects how the model reads complaint and violation totals — more units means more potential sources.

Neighborhood location

Precise location is a proxy for neighborhood-level risk — some SF blocks have systematically higher DBI activity.

Building permits, owner's portfolio

Permits pulled across all of this owner's buildings over 7 years.

12-Month severity forecast
No violation 42.3%
Moderate concern 16.3%
Severe concern 41.4%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

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The story over time

912-916 Union St event timeline

Violations, complaints, fire incidents, permits, and buyouts — most recent records in order.

No dated public records on file yet.
Every record we have

Full data for 912-916 Union St apartments

13 SF public datasets for this parcel — permits, violations, complaints, fire records, 311 calls, planning records, and buyouts.

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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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