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1136-1140 Mason St

Nob Hill, SF 94108 0212025 3 units · 3 fl · 1912

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 Nob Hill
At or below average
avg 2.4
0
FewerMore

This building has 0 novs (7y), at or below the Nob Hill average of 2.4.

Rent & eviction protection

Is 1136-1140 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 1912
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 built1912
Total area4,500 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0212025
Ownership

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

Owner name
Irene Gordon Lee Lvg Tr
Mailing address
2468 Porterfield Ct Mountain View CA 94040
Last sale
080905

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.

1138 Mason St, San Francisco, CA 94108
1136 Mason St, San Francisco, CA 94108
1140 Mason St, San Francisco, CA 94108
Augrented Insights
Initial analysis

The three-unit residential building at 1136-1140 Mason Street in Nob Hill, owned by the Irene Gordon Lee Living Trust, is a three-story flats and duplex structure built in 1912. The property has undergone several significant improvements, most notably a complete reroofing project in 2004 costing $17,250, and the installation of a new garage door and motor the same year. Fire safety upgrades were attempted in 2004 with applications for fire sprinkler work, though those permits expired, and additional sprinkler and alarm system work was permitted in 2005.

The building has experienced multiple routine housing inspections over the years, with several violations identified in 2000 related to fire safety and security, including issues with garbage receptacles, fire extinguisher maintenance, and emergency egress from sleeping rooms. A 2001 inspection noted dry rot in rear stairs, and in 2009 there were concerns about water heater seismic bracing. While most of these violations were eventually abated, including a water leakage issue in 2002 affecting neighboring property, a routine inspection from 2016 remains active according to current records. The building has experienced multiple fire alarm incidents, though all were determined to be false alarms or malfunctions with no civilian injuries reported. Recent history from 2019 through 2024 shows various neighborhood-related issues such as parking concerns, garbage, and debris on surrounding streets, and noise complaints, which are more reflective of neighborhood conditions than building-specific issues.

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

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Risk rating

How 1136-1140 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 1125 buildings in this neighborhood, 338 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
75%
No DBI
violation
25%
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 location

Precise location is a proxy for neighborhood-level risk — some SF blocks have systematically higher DBI activity.

Neighborhood (ZIP code)

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

Construction spend, owner's portfolio

Estimated permit value across all of this owner's buildings.

12-Month severity forecast
No violation 46.8%
Moderate concern 29.4%
Severe concern 23.8%
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

1136-1140 Mason St event timeline

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

2026
Plumbing Permit Apr 09
Work category: 1p; replace water main whit new 2" copper from meter to were split to water heaters install new reduce pressure backflow preventer
Complete
Plumbing PermitFeb 23
Alt existing plumbing and new plumbing for old and new bathrooms

See all 16 events

Full history back to 2025 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 1136-1140 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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