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477-481 Duboce Ave

Duboce Triangle, SF 94117 3537053 3 units · 3 fl · 1900

This building has significantly more problems than most nearby buildings. A handful of unresolved issues. Worth a careful walk-through and pointed questions.

NOVs (7y) vs. neighborhood
Compared to a typical building in Duboce Triangle
Above average
avg 2.3
8
FewerMore

This building has 8 novs (7y), above the Duboce Triangle average of 2.3.

Rent & eviction protection

Is 477-481 Duboce Ave 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 1900
2 or more units
3 units
Property type
Multi-Family Residential
Zoning
RM2
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
Units3
Floors3
Year built1900
Total area4,428 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot3537053
Ownership

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

Owner name
Scott Mayfield Separate Pro
Mailing address
Mayfield Scott Ttee 1825 Cravens Ln Carpinteria CA 93013
Last sale
111214

Landlord portfolio

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

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Multiple entrances & addresses

Included addresses

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

481 Duboce Ave, San Francisco, CA 94117
477 Duboce Ave, San Francisco, CA 94117
479 Duboce Ave, San Francisco, CA 94117
Augrented Insights
Initial analysis

The three-unit, three-story multi-family residential building at 477-481 Duboce Avenue in the Duboce Triangle neighborhood, owned by Scott Mayfield Separate Pro, has undergone significant structural and safety improvements since its construction in 1900. The property has experienced several major foundation work projects, most notably in 2014 when substantial repairs were performed on multiple walls and beams, costing approximately $75,000. More recent improvements include the installation of new heating systems throughout 2021, with three separate heating unit replacements totaling approximately $2,000. The building faced multiple housing code violations in early 2021, primarily related to heating system failures and staircase safety issues, including missing handrails that had been reported as causing accidents.

During 2020-2021, tenants raised several concerns regarding building systems, including inadequate kitchen and bathroom ventilation following recent renovations, which allegedly led to frequent fire alarm activations. These issues were addressed through various permits and inspections, including the installation of handrails in March 2021 to resolve safety complaints. The building has a history of routine inspections and violations dating back to 2000, with the most recent inspection-related issues being resolved by mid-2021. Infrastructure maintenance remains an ongoing concern, with recent 311 calls in 2023-2024 reporting sidewalk defects and graffiti issues, though many of these cases have been resolved or are currently under review. The property underwent a tenant buyout at 479 Duboce Avenue in June 2021 for $25,000.

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

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Risk rating

How 477-481 Duboce Ave'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
15th percentile

Out of 287 buildings in this neighborhood, 244 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
44%
No DBI
violation
56%
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.

DBI tenant complaints (past 7 years)

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

DBI complaint rate, owner's portfolio

Per-building complaint rate across the owner's portfolio.

Building age

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

12-Month severity forecast
No violation 22.6%
Moderate concern 43.3%
Severe concern 34.2%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

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The story over time

477-481 Duboce Ave event timeline

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

2025
311 Request Nov 02
Sidewalk defect
collapsed sidewalk

See all 20 events

Full history back to 2020 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 477-481 Duboce Ave apartments

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

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