Free SF apartment background check

414-450 Duboce Ave

Hayes Valley, SF 94117 0875022 25 units · 3 fl · 1911

This building has far more open problems than almost any other in the neighborhood. Renters here report frequent, slow-to-fix problems. Get repair promises in writing and check the unit before signing.

NOVs (7y) vs. neighborhood
Compared to a typical building in Hayes Valley
Above average
avg 2.3
7
FewerMore

This building has 7 novs (7y), above the Hayes Valley average of 2.3.

Rent & eviction protection

Is 414-450 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 1911
2 or more units
25 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
Units25
Floors3
Year built1911
Total area20,850 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0875022
Ownership

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

Owner name
P H Sonntag Inc
Mailing address
P.o. Box 10493 Napa CA 94581
Last sale
000000

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.

436 Duboce Ave, San Francisco, CA 94117
422 Duboce Ave, San Francisco, CA 94117
426 Duboce Ave, San Francisco, CA 94117
418 Duboce Ave, San Francisco, CA 94117
420 Duboce Ave, San Francisco, CA 94117
428 Duboce Ave, San Francisco, CA 94117
424 Duboce Ave, San Francisco, CA 94117
416 Duboce Ave, San Francisco, CA 94117
434 Duboce Ave, San Francisco, CA 94117
414 Duboce Ave, San Francisco, CA 94117
432 Duboce Ave, San Francisco, CA 94117
430 Duboce Ave, San Francisco, CA 94117
450 Duboce Ave, San Francisco, CA 94117
Augrented Insights
Initial analysis

The 25-unit multi-family residential building at 414-450 Duboce Ave in Hayes Valley, owned by P H Sonntag Inc, has been actively maintained and upgraded since its construction in 1911. Most notably, in mid-2024, the building underwent significant fire safety system upgrades, including the replacement of the fire alarm system to comply with San Francisco Fire Department regulations, with related violations for sprinkler maintenance and alarm systems subsequently abated by August 2024. The property has experienced recurring issues with its heating and hot water systems, as evidenced by complaints in 2021 and July 2023 about no heat/hot water problems, and recent complaints about loud piping sounds in January 2025.

The building has undergone various repairs and improvements over the years, including sewer repairs in 2019, dry rot remediation on rear stairs in 2014, and multiple unit-specific bathroom renovations in 2010. Several building code violations were documented in 2006-2007 regarding heating, security, and sanitation issues, including rodent infestation and window repairs, though these were all abated by February 2007. Recent building complaints indicate ongoing maintenance and quality control challenges, including common area concerns filed in May 2023 that remain active as of October 2023. While the property has generally maintained compliance with safety requirements, there have been periodic fire safety inspections resulting in both "no merit" findings and violations that required correction, most recently in 2023-2024.

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

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Risk rating

How 414-450 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
5th percentile

Out of 1027 buildings in this neighborhood, 976 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
17%
No DBI
violation
83%
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.

Building size

Total floor area — a proxy for building scale and the number of systems (plumbing, electrical, HVAC) that can fail.

NOV rate, owner's portfolio

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

12-Month severity forecast
No violation 12.1%
Moderate concern 54.9%
Severe concern 33.0%
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

414-450 Duboce Ave event timeline

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

2026
DBI Complaint Apr 17
Date last observed: 16-apr-26; time last observed: 4/16/2026; floor: 2; unit: 3; exact location: side bldg; building type: residence/dwelling structural problems; ; additional information: a portion of my residential unit is suspended/cantilevered. i am concerned the building may not meet current seismic safety and structural code requirements, including proper foundation anchoring, cripple wall bracing, and water heater strapping as required under the california existing building code. i am requesting an inspection to assess whether the structure is up to code for earthquake safety. the building was built prior to 1973.;
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See all 22 events

Full history back to 2019 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 414-450 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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