Free SF apartment background check

735-767 Mason St

Downtown, SF 94108 0274025 17 units · 4 fl · 1908

This building has a higher-than-average number of open problems nearby. Renters here report frequent, slow-to-fix problems. Get repair promises in writing and check the unit before signing.

NOVs (7y) vs. neighborhood
Compared to a typical building in Downtown
At or below average
avg 6.9
5
FewerMore

This building has 5 novs (7y), at or below the Downtown average of 6.9.

Rent & eviction protection

Is 735-767 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 1908
2 or more units
17 units
Property type
Multi-Family Residential
Zoning
RM4
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
Units17
Floors4
Year built1908
Total area14,256 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0274025
Ownership

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

Owner name
Nancy Mar Tr
Mailing address
Mar Nancy Ttee Po Box 641041 San Francisco CA 94164
Last sale
080706

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.

757 Mason St, San Francisco, CA 94108
735 Mason St, San Francisco, CA 94108
741 Mason St, San Francisco, CA 94108
759 Mason St, San Francisco, CA 94108
739 Mason St, San Francisco, CA 94108
753 Mason St, San Francisco, CA 94108
751 Mason St, San Francisco, CA 94108
763 Mason St, San Francisco, CA 94108
747 Mason St, San Francisco, CA 94108
755 Mason St, San Francisco, CA 94108
745 Mason St, San Francisco, CA 94108
749 Mason St, San Francisco, CA 94108
761 Mason St, San Francisco, CA 94108
743 Mason St, San Francisco, CA 94108
765 Mason St, San Francisco, CA 94108
767 Mason St, San Francisco, CA 94108
737 Mason St, San Francisco, CA 94108
Augrented Insights
Initial analysis

The four-story, 17-unit apartment building at 735-767 Mason Street, built in 1908, has undergone several significant structural and safety improvements over the past decade, most notably a complete soft-story retrofit completed in 2015 at a cost of $85,000, bringing the building into compliance with San Francisco's mandatory seismic retrofit requirements. The building's maintenance history shows attention to basic upkeep, including a $23,600 reroofing project completed in 2016 and the installation of new electrical grading in the foundation during the same year.

Recent concerns about building safety and habitability have surfaced, with the most current active complaint filed in March 2024 regarding common areas. A notable incident occurred in July 2019 involving hazardous materials, specifically paint stored near the furnace in the basement. The building experienced significant maintenance issues in 2012-2013, including multiple complaints about non-functional heaters, mold in bathrooms, and various code violations, though most of these issues appear to have been addressed by 2014. Several historical violations from 2000-2001 were documented, including problems with fire extinguishers and damaged stairs, but these were also abated. The building's owner, Nancy Mar Tr, has completed all required soft-story retrofit work and obtained the necessary certificates of final completion, demonstrating compliance with critical safety requirements.

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

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Risk rating

How 735-767 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
70th percentile

Out of 448 buildings in this neighborhood, 134 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
26%
No DBI
violation
74%
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.

Number of units

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

DBI tenant complaints (past 7 years)

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

12-Month severity forecast
No violation 13.6%
Moderate concern 76.6%
Severe concern 9.9%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

735-767 Mason St apartment reviews

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The story over time

735-767 Mason St event timeline

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

2026
Fire Complaint May 24
Sleeping Area Requirement
Violation Issued

See all 9 events

Full history back to 2019 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 735-767 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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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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