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1857-1859 Mason St

Russian Hill, SF 94133 0100001 7 units · 3 fl · 1908

This building has a substantial enforcement record over the last seven years, and our model predicts continuing maintenance failures over the next 12 months. Read the records below before you sign. Ask which issues were resolved, get repair commitments in writing, and inspect the unit yourself.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Russian Hill — not a forecast
Above average
avg 1.9
15
FewerMore

This building has 15 novs (7y), above the Russian Hill average of 1.9.

Rent & eviction protection

Is 1857-1859 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
7 units
Property type
Multi-Family Residential
Zoning
RM1
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 1908
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
Units7
Floors3
Year built1908
Total area4,998 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0100001
Ownership

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

Mailing address
P O Box 411 Tiburon CA 94920
Last sale
September 28, 2018

Landlord portfolio

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

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Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

1859 Mason St, San Francisco, CA 94133
1857 Mason St, San Francisco, CA 94133
Augrented Insights
Initial analysis

The 7-unit, 3-story building at 1857-1859 Mason Street in San Francisco's Russian Hill neighborhood, constructed in 1908 and currently owned by 1857 Mason Street LLC, has experienced several significant maintenance and safety issues in recent years. Most notably, in May 2023, the building received multiple Notices of Violation related to critical safety systems, including requirements for gas shutoff tools, fire escape drop ladder functionality, smoke and carbon monoxide detector verification, and inspection of exterior appendages such as decks, balconies, and stair systems. These violations, while listed as "not active," indicate serious concerns about the building's safety infrastructure.

Additional concerning incidents include a January 2026 complaint detailing multiple maintenance issues within the building, such as buckling floorboards, a malfunctioning bedroom door, security concerns with the entrance handle, broken foyer lighting, drainage problems near the garbage area, rotting stairs at the back, and a damaged security room door. Two significant water-related issues were reported in early 2023: one involving mold and ceiling leaks during rain events (April 2023) and a separate complaint about roof drainage problems (February 2023). The building also experienced environmental concerns in August 2023, when lint and debris from a laundromat's roof vents were reported to be affecting surrounding properties. While numerous 311 service requests have been filed in recent years, primarily related to parking issues and garbage concerns, these are less critical than the building's more pressing maintenance and safety violations.

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

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Risk rating

How 1857-1859 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
8thpercentile

Out of 1133 buildings in this neighborhood, 1042 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
22%
No DBI
violation
78%
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.

Number of units

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

Director's hearing rate, owner's portfolio

Per-building rate of director's hearings across the owner's portfolio.

DBI tenant complaints (past 7 years)

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

12-Month risk forecast
High failure risk 78%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

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On the map

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8 found
The story over time

1857-1859 Mason St event timeline

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

2026
311 Request Jul 28
Garbage and debris
other loose garbage debris yard waste
311 RequestMay 04
Other illegal parking

See all 14 events

Full history back to 2023 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 1857-1859 Mason St apartments

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

Side by side

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