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3339-3341 21St St

Eureka Valley/Dolores Heights, SF 94110 3617075 4 units · 2 fl · 1900

This building has more problems than most buildings in this neighborhood. Few open issues; problems get fixed quickly. A reasonable bet for a smooth tenancy.

NOVs (7y) vs. neighborhood
Compared to a typical building in Eureka Valley/Dolores Heights
At or below average
avg 1.3
0
FewerMore

This building has 0 novs (7y), at or below the Eureka Valley/Dolores Heights average of 1.3.

Rent & eviction protection

Is 3339-3341 21St 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 1900
2 or more units
4 units
Property type
Multi-Family Residential
Zoning
RH3
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
Units4
Floors2
Year built1900
Total area2,428 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3617075
Ownership

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

Owner name
Nelson John Eric & Friant J
Mailing address
Po Box 27587 San Francisco CA 94127
Last sale
050302

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.

3341 21st St, San Francisco, CA 94110
3339 21st St, San Francisco, CA 94110
Augrented Insights
Initial analysis

The two-story, four-unit multi-family residential building at 3339-3341 21st Street in the Eureka Valley/Dolores Heights neighborhood, built in 1900, has undergone several significant maintenance and safety improvements over the past two decades. The property has had recurring issues with stairs and deck maintenance, with repairs completed in 2004, 2009 (to address dry rot), and most recently in 2017 when the stair deck guardrails were repaired at a cost of $25,000. In 2017, the electrical system was substantially upgraded, including the removal of fuses and installation of new circuits in all units, along with an overhead to underground service change to 200-amp service. The building has undergone three major roofing projects, with the most recent reroofing in 2017 costing $21,816.

The property has experienced multiple building violations and complaints, primarily related to safety and maintenance issues. In 2004, violations were issued regarding stairs that required multiple repair permits, and in 2009, dry rot problems affected the deck and framing. A 2018 complaint alleged unauthorized construction of a deck and auto repair activities in the backyard, though this was later closed with no violation found. The building's parking situation has been clarified through NSR Record No. F215948, which allows for two off-street parking spaces in the rear yard, resolving past complaints about unauthorized use of the backyard for parking and auto repair. Recent exterior maintenance has included attention to street trees, sidewalk issues, and general cleaning, with the most recent concerns being tree-related (2023-2024) and sidewalk maintenance matters (2022). The building's historical records show a pattern of addressing safety and maintenance issues, particularly regarding stairs, decks, and electrical systems, with most violations being resolved through proper permitting and repairs.

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

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Risk rating

How 3339-3341 21St 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
26th percentile

Out of 1278 buildings in this neighborhood, 946 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
60%
No DBI
violation
40%
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.

Neighborhood location

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

Building permits, owner's portfolio

Permits pulled across all of this owner's buildings over 7 years.

12-Month severity forecast
No violation 38.5%
Moderate concern 22.2%
Severe concern 39.3%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

3339-3341 21St St apartment reviews

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The story over time

3339-3341 21St St event timeline

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

2025
Planning Record Dec 23
UDU Screening
Closed - Informational
DBI ComplaintNov 12
Date last observed: 08-nov-25; time last observed: 11 am; identity of person performing the work: maroon colored truck. no name.; floor: ground; exact location: main bldg; building type: residence/dwelling illegal unit; work w/o permit; ; additional information: work being done at the ground floor to add a residential unit despite being told during the permit application process that an nsr prevents adding a 5th unit to the 4 unit building or expanding an existing 2nd floor unit down to the ground floor.;

See all 7 events

Full history back to 2025 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 3339-3341 21St St apartments

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

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