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401 Duncan St

Noe Valley, SF 94131 6602001 2 units · 3 fl · 1908

Nothing on record for this building in the last seven years, and our model puts it at a low risk of maintenance problems over the next 12 months. No public enforcement record to go on. Walk the building, ask the current tenants how repairs get handled, and get any promises in writing.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Noe Valley — not a forecast
At or below average
avg 1.2
0
FewerMore

This building has 0 novs (7y), at or below the Noe Valley average of 1.2.

Rent & eviction protection

Is 401 Duncan 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
2 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.

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
Units2
Floors3
Year built1908
Total area3,449 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot6602001
Ownership

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

Owner name
Mailing address
1450 Sanchez St San Francisco CA 94131
Last sale
March 16, 1999

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.

401 Duncan St, San Francisco, CA 94131
1450 Sanchez St, San Francisco, CA 94131
Augrented Insights
Initial analysis

The property at 401 Duncan Street is a three-story multi-family residential building located in Noe Valley, containing two units and constructed in 1908, currently owned by Lydia W Timken. The building underwent significant renovations between 2010-2011, including a major basement conversion project estimated at $60,000 to create a 2-bedroom apartment with living room and garage, followed by additional work costing $25,000 that was ultimately performed only at the basement level. The renovation period also included substantial infrastructure upgrades, with electrical work comprising a complete system installation with 100-amp service, multiple circuits, smoke detectors, and laundry facilities, along with plumbing improvements for hydronic heating and bathroom installations. Earlier improvements from the 1996-1997 period included structural enhancements, roof replacement, and aesthetic modifications such as a new fireplace and bay window.

Recent history of the property shows ongoing maintenance and some external issues, with multiple reports in early 2025 regarding garbage management in the vicinity, including overflowing city garbage cans and one report of human waste, with one case still marked as open. The street around the property has experienced various urban maintenance requirements, including parking enforcement actions, tree maintenance, graffiti removal, and a shared spaces violation related to crosswalk obstruction, suggesting an active urban environment with typical city challenges. While the building's major systems were modernized during the 2010-2011 renovation period, the property's recent maintenance record indicates periodic attention to external infrastructure and urban space management.

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

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Risk rating

How 401 Duncan 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
89thpercentile

Out of 1879 buildings in this neighborhood, 207 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
90%
No DBI
violation
10%
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.

Building age

Older buildings tend to have more maintenance challenges; SF's pre-1906 earthquake housing stock carries distinct risk.

Neighborhood location

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

Estimated permit spend (past 7 years)

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

12-Month risk forecast
Low failure risk 10%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

401 Duncan St apartment reviews

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On the map

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Buildings nearby
8 found
The story over time

401 Duncan St event timeline

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

2026
311 Request Mar 17
Other illegal parking
Parking Enforcement

See all 7 events

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

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Every record we have

Full data for 401 Duncan St apartments

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

Side by side

How 401 Duncan St compares to the neighborhood

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