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1249 Mason St

Nob Hill, SF 94108 0190004 3 units · 2 fl · 1925

A handful of records on file over the last seven years, and our model puts this building at a low risk of further maintenance problems in the next 12 months. A few records worth reading before you sign. Check whether they were closed out, and ask what was actually fixed.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Nob Hill — not a forecast
Above average
avg 2.4
4
FewerMore

This building has 4 novs (7y), above the Nob Hill average of 2.4.

The bar and the rating point different ways because they measure different things: the bar counts DBI violations already on file, the rating forecasts the next 12 months.

Rent & eviction protection

Is 1249 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 1925
2 or more units
3 units
Property type
Multi-Family Residential
Zoning
RC3
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 1925
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
Units3
Floors2
Year built1925
Total area2,910 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0190004
Ownership

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

Mailing address
1249 Mason St Apt 2 San Francisco CA 94108
Last sale
—

Landlord portfolio

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

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Augrented Insights
Initial analysis

The three-unit, two-story residential building at 1249 Mason Street in Nob Hill, owned by Lee Teung & Thomas K, was constructed in 1925 and has experienced several maintenance issues over its history, particularly in recent years. Most notably, in 2017, the building faced multiple plumbing-related violations including inadequate hot water temperatures, water heater problems, and the installation of two water heaters due to broken gas burner valves. This followed earlier concerns from 2015 regarding exterior paint conditions, with violations for peeling paint around windows and requirements for exterior repainting. The building's maintenance history shows attention to basic upkeep, with records of roofing work completed in 1999 and window installations in 1984.

The property has encountered recurring plumbing issues over the years, with documented problems in 2002 and 2004 involving water pressure, bathtub drain clogs, and faucet leaks. More recent maintenance compliance includes a routine safety inspection in 2015. While the building has had no recorded fire incidents involving injuries, there were two fire department responses noted: one for elevator rescue and another for a false alarm. Recent activity around the building, as evidenced by 311 calls, indicates ongoing local concerns primarily related to parking violations and some noise issues, though these are external to the building's structural and habitability conditions. The most recent permits on record are from 2015, suggesting limited recent building modifications or major repairs.

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

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Risk rating

How 1249 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

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
80thpercentile

Out of 1125 buildings in this neighborhood, 225 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
80%
No DBI
violation
20%
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.

Estimated permit spend (past 7 years)

Dollar value of permits pulled at this address — large recent spend can signal deferred-maintenance catch-up.

Construction spend, owner's portfolio

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

Building permits, owner's portfolio

Permits pulled across all of this owner's buildings over 7 years.

12-Month risk forecast
Low failure risk 20%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

1249 Mason St apartment reviews

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On the map

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8 found
The story over time

1249 Mason St event timeline

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

2026
311 Request Jul 02
Parking on sidewalk
Parking Enforcement
311 RequestMar 19
Parking on sidewalk

See all 5 events

Full history back to 2026 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 1249 Mason St apartments

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

Side by side

How 1249 Mason St compares to the neighborhood

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