Free SF apartment background check

9 Sumner St

South of Market, SF 94103 3730056 2 units · 2 fl · 1910

Nothing on record for this building in the last seven years, and our model puts it at a low risk of maintenance problems over the next 12 months. No public enforcement record to go on. Walk the building, ask the current tenants how repairs get handled, and get any promises in writing.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in South of Market — not a forecast
At or below average
avg 3.3
0
FewerMore

This building has 0 novs (7y), at or below the South of Market average of 3.3.

Rent & eviction protection

Is 9 Sumner 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 1910
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RED
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 1910
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
Units2
Floors2
Year built1910
Total area2,500 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3730056
Ownership

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

Owner name
Mailing address
9 Sumner St San Francisco CA 94103
Last sale
—

Landlord portfolio

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

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Multiple entrances & addresses

Included addresses

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

9 A Sumner St, San Francisco, CA 94103
9 Sumner St, San Francisco, CA 94103
9 C Sumner St, San Francisco, CA 94103
9 B Sumner St, San Francisco, CA 94103
Augrented Insights
Initial analysis

The two-unit residential building at 9 Sumner Street in San Francisco's South of Market neighborhood has a documented history spanning several decades, with significant attention required to its maintenance and regulatory compliance. Built in 1910, this two-story flats/duplex structure has undergone various permit processes between 1986 and 1998, including water service installation, deck repairs, and an attempt to add a garage door to the lower unit. A notable housing inspection complaint from 1996 regarding an illegal basement unit with inadequate heating and metering was eventually resolved by January 1997. More recently, there was a violation related to short-term rental activity through Airbnb, which was abated with penalties paid.

The property has experienced ongoing environmental challenges in the immediate vicinity, particularly during 2024, with multiple incidents of human waste, medical waste (needles), and general garbage issues reported through 311 calls. The building's surroundings have required frequent attention from Street and Environmental Services, with eight such reports between January and October 2024. There were also two driveway blocking incidents in 2024 that required parking enforcement intervention. While the most recent building permits and complaints suggest no active structural or safety issues with the building itself, the area around the property has faced recurring sanitation and maintenance challenges that have required municipal intervention.

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

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Risk rating

How 9 Sumner 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
72ndpercentile

Out of 430 buildings in this neighborhood, 120 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
81%
No DBI
violation
19%
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.

Neighborhood (ZIP code)

The ZIP code captures local housing market and enforcement patterns that affect all buildings in the area.

Building size

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

Building age

Older buildings tend to have more maintenance challenges; SF's pre-1906 earthquake housing stock carries distinct risk.

12-Month risk forecast
Low failure risk 19%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

9 Sumner St apartment reviews

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On the map

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8 found
The story over time

9 Sumner St event timeline

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

2026
311 Request Mar 02
Garbage and debris
human waste or urine

See all 5 events

Full history back to 2024 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 9 Sumner St apartments

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

Side by side

How 9 Sumner St compares to the neighborhood

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