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4421-4423 Mission St

Excelsior, SF 94112 6013027 2 units · 2 fl · 1947

This building has a higher-than-average number of open problems nearby. Few open issues; problems get fixed quickly. A reasonable bet for a smooth tenancy.

NOVs (7y) vs. neighborhood
Compared to a typical building in Excelsior
At or below average
avg 1.4
0
FewerMore

This building has 0 novs (7y), at or below the Excelsior average of 1.4.

Rent & eviction protection

Is 4421-4423 Mission 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 1947
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
NC3
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
Units2
Floors2
Year built1947
Total area2,550 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot6013027
Ownership

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

Owner name
De Guzman Vilma M
Mailing address
35 Dichiera Ct San Francisco CA 94112
Last sale
120517

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.

4421 Mission St, San Francisco, CA 94112
4423 Mission St, San Francisco, CA 94112
Augrented Insights
Initial analysis

The two-unit, two-story mixed-use building at 4421-4423 Mission Street, constructed in 1947, has undergone several significant changes and faced multiple safety concerns over the years. Most recently, in October 2024, the building underwent re-roofing work costing $16,750. However, there are ongoing safety concerns, particularly about unpermitted structures; an active violation from 2016 cites multiple unauthorized structures in the rear yard creating a "heavy fire load." The building has a documented history of fire safety issues, with eight fire complaints between 2006 and 2016, mostly related to combustible materials and weeds, though most were promptly corrected. A recent tenant complaint from November 2024 reported issues with restaurant exhaust systems causing noise and carbon dioxide concerns.

The property has seen various improvements and modifications, including a 2011 installation of an automatic fire suppression system, a 2010 restaurant remodel with kitchen hood installation, and several plumbing and electrical upgrades between 2008-2010. Historical complaints indicate past safety concerns, including three separate gas leak incidents in 1995, though these were promptly resolved. The building has undergone some structural changes, including the demolition of a 1-story storage unit in 2018, and there were earlier complaints about water heater installations and drainage issues that were resolved in 2009. Recent maintenance activities include a sewage backup response in October 2024 and multiple reports of garbage and debris, though these environmental issues are mostly administrative rather than structural or safety concerns.

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

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Risk rating

How 4421-4423 Mission 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
48th percentile

Out of 337 buildings in this neighborhood, 175 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
70%
No DBI
violation
30%
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.

Neighborhood location

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

Property class: apartment building

Apartment building — this property classification influences expected violation rates.

Neighborhood (ZIP code)

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

12-Month severity forecast
No violation 63.3%
Moderate concern 21.1%
Severe concern 15.6%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
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The story over time

4421-4423 Mission St event timeline

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

2026
311 Request Jun 05
Garbage and debris
refrigerator appliance

See all 5 events

Full history back to 2024 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 4421-4423 Mission St apartments

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

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