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2455 Union St

Cow Hollow, SF 94123 0537001F 13 units · 3 fl · 1924

A handful of records on file over the last seven years, and our model sees a moderate chance of more in the next 12 months. A few records worth reading before you sign. Check whether they were closed out, and ask what was actually fixed.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Cow Hollow — not a forecast
Above average
avg 0.7
1
FewerMore

This building has 1 novs (7y), above the Cow Hollow average of 0.7.

Rent & eviction protection

Is 2455 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 1924
2 or more units
13 units
Property type
Multi-Family Residential
Zoning
RM1
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.

Statewide backstop · AB 1482

California Tenant Protection Act of 2019

Even when a building isn't covered by local rent stabilization, the statewide Tenant Protection Act (AB 1482) may still apply. It caps annual rent increases and requires the landlord to state a legal reason to end most tenancies.

15+ years since occupancy
Built 1924
Annual rent increase cap
5% + CPI, max 10%
Just-cause eviction
After 12 months
Local rent control likely takes priority. This building appears to fall under the local ordinance above, which is stronger than AB 1482. Where a local just-cause ordinance applies, its rules govern instead of the state cap.

AB 1482 does not apply to single-family homes and condos unless owned by a corporation, REIT, or an LLC with a corporate member; to owner-occupied duplexes; or to deed-restricted affordable housing. The Act is in effect until January 1, 2030. Not legal advice — see the California landlord–tenant guide.

Building characteristics
Units13
Floors3
Year built1924
Total area11,808 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0537001F
Ownership

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

Owner name
Mailing address
P O Box 2337 San Anselmo CA 94979
Last sale
May 05, 2010

Landlord portfolio

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

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Augrented Insights
Initial analysis

2455 Union Street is a three-story, 13-unit multi-family residential building constructed in 1924 in the Cow Hollow neighborhood, currently owned by 2455 Union LLC. The building has undergone several significant renovations and repairs over the years, with the most recent work completed in 2024 involving comprehensive kitchen and bathroom remodels in unit #412, including both plumbing and electrical updates, at a combined cost of approximately $57,000. The building has faced numerous maintenance and safety challenges, particularly between 2013-2017, with multiple violations and complaints regarding water issues, including a 2013 complaint about a leaking bathtub faucet causing mold and paint peeling, a 2014 complaint about leaking pipes in the garage, and a 2017 incident involving falling plaster. The building's mechanical systems have required significant attention, including the deactivation and removal of a steam boiler in 2022, and various sewer line repairs and replacements between 2009-2018. Several fire safety issues have been documented, including fire extinguisher maintenance concerns in 2021 and 2024, with a notable carbon monoxide incident recorded in the fire incident data. The elevator system has also raised safety concerns, with a 2015 complaint about exposed shaft issues, though a subsequent inspection reportedly addressed the problem. Recent maintenance activities have focused on unit improvements, particularly in unit #412, but the building's historical record shows a pattern of water-related issues and mechanical system challenges that have required ongoing attention from management and various contractors.

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

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Risk rating

How 2455 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

Lower risk — safer than most nearby

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

Typical — about average for the neighborhood

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

Higher risk — riskier than most nearby

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

Neighborhood percentile
8thpercentile

Out of 861 buildings in this neighborhood, 792 are predicted to be safer. The band is relative to this neighborhood, so a share of every neighborhood falls in each colour.

RiskiestSafest
Predicted 12-month outcome
47%
No DBI
violation
53%
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.

Building size

Total floor area — a proxy for building scale and the number of systems (plumbing, electrical, HVAC) that can fail.

DBI tenant complaints (past 7 years)

Formal complaints tenants filed with DBI about this building over 7 years.

12-Month risk forecast
Moderate failure risk 53%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

2455 Union St apartment reviews

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On the map

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The story over time

2455 Union St event timeline

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

2025
Fire Complaint Aug 19
Sprinkler/Standpipe Systems
No Merit

See all 15 events

Full history back to 2020 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 2455 Union St apartments

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

Side by side

How 2455 Union St compares to the neighborhood

This building against comparable properties in Cow Hollow. Toggle filters to narrow the peer group.

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

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