Free SF apartment background check

807-811 Mason St

Downtown, SF 94108 0254008 3 units · 3 fl · 1909

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 Downtown
At or below average
avg 6.9
0
FewerMore

This building has 0 novs (7y), at or below the Downtown average of 6.9.

Rent & eviction protection

Is 807-811 Mason 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 1909
2 or more units
3 units
Property type
Multi-Family Residential
Zoning
RM3
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
Units3
Floors3
Year built1909
Total area4,140 sq ft
Property typeMulti-Family Residential
Tax statusReligious
Blocklot0254008
Ownership

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

Owner name
San Francisco Lodge Of The
Mailing address
David Thompson 809 Mason St San Francisco CA 94108
Last sale
091919

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.

809 Mason St, San Francisco, CA 94108
807 Mason St, San Francisco, CA 94108
811 Mason St, San Francisco, CA 94108
Augrented Insights
Initial analysis

The three-story multi-family residential building at 807-811 Mason Street, owned by San Francisco Lodge Of The, was constructed in 1909 and contains three units. The property has undergone several significant maintenance and improvement projects, most notably in September 2021 when both roof replacement and the installation of James Hardie siding on the back wall were completed at costs of approximately $16,852 and $33,918 respectively. In 1998, substantial structural work was performed including the installation of a new basement floor slab, grade beam, posts, and retaining wall, as well as a new slab with rebar reinforcement. Historical records show a series of routine housing inspections took place in 2000, 2010, and 2016, with the latter inspection revealing multiple violations related to fire safety equipment and structural maintenance requirements, though all were promptly abated by May 2016.

The building's recent history is marked by a concerning pattern of waste management issues, with ten reports of overflowing city garbage cans between December 2024 and January 2025, including one instance of abandoned furniture. The property has experienced three false fire alarm incidents between 2009 and 2016, none resulting in civilian injuries, and one fire alarm systems complaint in 2009 that was found to have no merit. The building's maintenance history shows regular upkeep, with previous roofing work completed in 1995 and kitchen renovations attempted in 1994 (though those permits expired). Recent street cleaning reports indicate ongoing challenges with garbage disposal in the vicinity of the property, with all reported cases being officially resolved through Recology services.

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

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Risk rating

How 807-811 Mason 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
99th percentile

Out of 448 buildings in this neighborhood, 4 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
85%
No DBI
violation
15%
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.

Building size

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

Neighborhood (ZIP code)

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

Building age

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

12-Month severity forecast
No violation 66.5%
Moderate concern 22.9%
Severe concern 10.6%
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

807-811 Mason St event timeline

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

2026
311 Request Mar 19
Garbage and debris
other bagged boxed contained garbage
311 RequestMar 12
Garbage and debris

See all 8 events

Full history back to 2021 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 807-811 Mason St apartments

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

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