Free SF apartment background check

2125 Mason St

North Beach, SF 94133 0065006 3 units · 2 fl · 1906

This building has significantly more problems than most nearby buildings. A handful of unresolved issues. Worth a careful walk-through and pointed questions.

NOVs (7y) vs. neighborhood
Compared to a typical building in North Beach
Above average
avg 2.1
34
FewerMore

This building has 34 novs (7y), above the North Beach average of 2.1.

Rent & eviction protection

Is 2125 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 1906
2 or more units
3 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
Units3
Floors2
Year built1906
Total area3,204 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot0065006
Ownership

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

Owner name
Chow Henry H & Mon Quan
Mailing address
2430 38th Ave San Francisco CA 94116
Last sale
050500

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.

8 Newell St, San Francisco, CA 94133
2125 Mason St, San Francisco, CA 94133
Augrented Insights
Initial analysis

The 2125 Mason Street property is a two-story, three-unit multi-family residential building located in North Beach, owned by Chow Henry H & Mon Quan, and constructed in 1906. The building has experienced several significant issues over recent years, particularly in 2021-2022, when multiple building violations were documented, including problems with heating systems, mold/mildew, broken windows, and more. During this period, the building received multiple notices of violation between September 2021 and April 2022, with most being abated by December 2022. The property underwent heating system improvements in 2022, including the replacement of two gas furnaces and the installation of new handrails to comply with building codes. Earlier maintenance work includes a 2006 kitchen remodel and various repairs for dry rot and other issues.

The building's recent history shows ongoing maintenance challenges, with active complaints about heating issues as of 2021-2022. Several 311 calls in 2023-2024 have been recorded regarding external issues such as graffiti, waste cleanup, and parking concerns, though these are related to the building's surroundings rather than the structure itself. A significant tenant buyout occurred in July 2022 for $174,593.60 involving one tenant at the adjacent address of 2115 Mason Street. The building's permit history shows efforts to address code violations and perform necessary upgrades, though some permits have experienced expiration and renewal processes, such as the 2004-2006 stair repair work.

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

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Risk rating

How 2125 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
14th percentile

Out of 362 buildings in this neighborhood, 311 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
34%
No DBI
violation
66%
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.

NOV rate, owner's portfolio

Per-building NOV rate across everything this owner manages — high rates signal pattern neglect.

DBI tenant complaints (past 7 years)

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

Notices of Violation (past 7 years)

DBI issued Notices of Violation at this address over the last 7 years — a direct record of code enforcement activity.

12-Month severity forecast
No violation 18.1%
Moderate concern 32.9%
Severe concern 48.9%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
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On the map

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The story over time

2125 Mason St event timeline

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

2025
311 Request Aug 16
Amplified sound electronics
Noise
311 RequestJan 31
Garbage and debris

See all 17 events

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

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Every record we have

Full data for 2125 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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