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21 Gaven St

Portola, SF 94134 5857001 3 units · 2 fl · 1923

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 Portola
At or below average
avg 1.8
0
FewerMore

This building has 0 novs (7y), at or below the Portola average of 1.8.

Rent & eviction protection

Is 21 Gaven 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 1923
2 or more units
3 units
Property type
Multi-Family Residential
Zoning
RH1
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
Floors2
Year built1923
Total area2,900 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot5857001
Ownership

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

Owner name
Lopez Hector Orlando Florez
Mailing address
2300-2302 San Bruno Ave San Francisco CA 94134
Last sale
022708

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.

21 Gaven St, San Francisco, CA 94134
2302 A San Bruno Ave, San Francisco, CA 94134
2300 San Bruno Ave, San Francisco, CA 94134
Augrented Insights
Initial analysis

The multi-family residential building at 21 Gaven Street in the Portola neighborhood is a two-story structure built in 1923, containing three units on a single parcel and currently owned by Hector Orlando Florez Lopez. The property has undergone several significant renovations over the years, with major work completed in 2006 including the replacement of all windows with double-glaze units, repairs to exterior decks and stairs, and a comprehensive remodel of the second-floor living unit valued at $25,000. During this period, electrical upgrades were also performed, including the installation of a 200-amp main panel and extensive electrical work including lights, switches, and receptacles.

The building has experienced several regulatory challenges, most notably in 2004 when a complaint was filed regarding the illegal conversion of commercial space to residential use, resulting in multiple life safety violations including non-operable windows, uninspected bathroom and kitchen installations, lack of smoke detectors, and improper ventilation. These violations were officially abated by March 2005. Subsequent complaints in 2006 raised concerns about unauthorized construction work, including a new deck, stairs, and window installations, though these issues were later resolved. More recent calls to 311 (as recent as January 2025) have primarily concerned street cleaning and debris removal, with multiple reports of garbage and waste in the vicinity, though these are external to the building itself. A 2009 fire code violation was recorded for an address listed as 170 Boutwell Street, but it is unclear if this is directly related to the subject property, and this violation has since been closed.

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

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Risk rating

How 21 Gaven 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
42th percentile

Out of 255 buildings in this neighborhood, 148 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.

Neighborhood location

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

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 42.3%
Moderate concern 44.1%
Severe concern 13.5%
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

21 Gaven St event timeline

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

2026
311 Request Apr 09
Garbage and debris
furniture

See all 3 events

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

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Every record we have

Full data for 21 Gaven 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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