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171 Langton St

South of Market, SF 94103 3755117 10 units · 3 fl · 1915

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 South of Market — not a forecast
Above average
avg 3.3
20
FewerMore

This building has 20 novs (7y), above the South of Market average of 3.3.

Rent & eviction protection

Is 171 Langton 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 1915
2 or more units
10 units
Property type
Multi-Family Residential
Zoning
SLR
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 1915
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
Units10
Floors3
Year built1915
Total area3,312 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3755117
Ownership

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

Mailing address
15 Mio Corte Millbrae CA 94030
Last sale
April 07, 2004

Landlord portfolio

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

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Augrented Insights
Initial analysis

The 10-unit, three-story apartment building at 171 Langton Street in the South of Market neighborhood, owned by Langton Global Investment L, was built in 1915 and has experienced several significant maintenance and safety issues over recent years. In 2017-2018, the building faced substantial violations including problems with smoke detectors, carbon monoxide alarms, general dilapidation, mold, electrical issues, and plumbing problems, particularly in Unit 2, which had severe water leakage affecting multiple rooms and persistent electrical problems. These violations were addressed through multiple building permits, including window replacements and deck repairs. The building also underwent several necessary maintenance projects, such as window replacements (2018, 2013, 1997), deck repairs (2018, 2009), and roof work (2006).

The property has a concerning history of fire safety violations, with multiple issues reported between 2016-2022 including problems with fire extinguishers, alarm systems, and blocked exits. A pattern of fire alarm activations without actual fires has been recorded, along with a carbon monoxide detector activation. More recently, in 2022, there were three fire safety complaints related to extinguishers and alarm systems, all of which were corrected. The building has also faced structural and maintenance issues, as evidenced by complaints regarding a missing stairwell window, peeling walls, and electrical problems. In 2020, there was a violation related to building owner contact posting requirements. A notable incident occurred in late 2024 with multiple reports of garbage and debris issues near the property, though these are external to the building itself. The building's recent history shows a pattern of addressing violations, though many issues required multiple permits and inspections to resolve, indicating ongoing maintenance challenges.

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

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Risk rating

How 171 Langton 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
20thpercentile

Out of 430 buildings in this neighborhood, 344 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
27%
No DBI
violation
73%
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.

Neighborhood (ZIP code)

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

Neighborhood location

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

12-Month risk forecast
High failure risk 73%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

171 Langton St apartment reviews

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On the map

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The story over time

171 Langton St event timeline

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

2026
311 Request Jun 22
Public works
bsm complaint

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 171 Langton St apartments

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

Side by side

How 171 Langton St compares to the neighborhood

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