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231 Valley St

Noe Valley, SF 94131 6619026 4 units · 2 fl · 1965

This building has far more open problems than almost any other in the neighborhood. A handful of unresolved issues. Worth a careful walk-through and pointed questions.

NOVs (7y) vs. neighborhood
Compared to a typical building in Noe Valley
Above average
avg 1.2
16
FewerMore

This building has 16 novs (7y), above the Noe Valley average of 1.2.

Rent & eviction protection

Is 231 Valley 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 1965
2 or more units
4 units
Property type
Multi-Family Residential
Zoning
RH2
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
Units4
Floors2
Year built1965
Total area4,060 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot6619026
Ownership

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

Owner name
Takahashi Masashi & Margare
Mailing address
8 Forest Knolls Dr San Francisco CA 94131
Last sale
000000

Landlord portfolio

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

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Augrented Insights
Initial analysis

The two-story, four-unit apartment building at 231 Valley Street in Noe Valley, owned by Takahashi Masashi & Margare, has a significant history of maintenance and structural issues since its construction in 1965. Most recently, in early 2024, Unit 4 underwent bathroom renovations to address mold and plumbing issues, following multiple complaints in late 2023 about leaking pipes and black mold in the bathroom and kitchen. The building's history suggests recurring plumbing and moisture problems, with similar issues documented in 2001-2002, including leaky ceilings and garage water accumulation. The property has undergone several significant modifications, including an attempted ground floor living space incorporation in 2002-2003 (though permits expired), electrical rewiring in 2003, and various maintenance work such as reroofing in 1998, dry rot repairs in 1985, and code compliance updates in 1986.

The building experienced several health and safety violations in 2001, requiring corrections to fire safety systems, smoke detectors, interior surfaces, and mold issues, though these were ultimately abated by October 2001. A recent active health and safety inspection was opened in November 2023. The property has also seen multiple drive-by blocking complaints in the past year, though these are not directly related to building conditions. Historical complaints include concerns about an illegal unit in or behind the garage (2002), which was resolved, and routine inspections in 2001 and 2008. While the building has received various repairs and improvements over the years, the recurring pattern of plumbing and moisture-related issues suggests ongoing infrastructure challenges that have required multiple interventions.

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

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Risk rating

How 231 Valley 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
8th percentile

Out of 1879 buildings in this neighborhood, 1729 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
42%
No DBI
violation
58%
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.

NOV rate, owner's portfolio

Per-building NOV rate across everything this owner manages — high rates signal pattern neglect.

Notices of Violation (past 7 years)

DBI issued Notices of Violation at this address over the last 7 years — a direct record of code enforcement activity.

Number of units

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

12-Month severity forecast
No violation 12.5%
Moderate concern 21.9%
Severe concern 65.6%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

231 Valley St apartment reviews

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The story over time

231 Valley St event timeline

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

2025
DBI Complaint Jan 23
No heat
Housing Inspection Services

See all 12 events

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

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Every record we have

Full data for 231 Valley 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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