Free SF apartment background check

3320 21St St

Eureka Valley/Dolores Heights, SF 94110 3608011 4 units · 2 fl · 1900

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 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 3320 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 area4,215 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3608011
Ownership

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

Owner name
Pierce 2020 Revoc Tr
Mailing address
Pierce Mark L & Tia K Ttees 4304 Grove St Sonoma CA 95476
Last sale
000000

Landlord portfolio

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

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Augrented Insights
Initial analysis

The two-story, four-unit multi-family residential building at 3320 21st St, owned by Pierce 2020 Revoc Tr, has a significant history dating back to its 1900 construction in the Eureka Valley/Dolores Heights neighborhood. The property has undergone various improvements and repairs over the years, including foundation work (1988), kitchen/bath remodeling (2000), and multiple attempts to add accessory dwelling units in the basement (most recently in 2018, though these permits were withdrawn). The building has faced several maintenance and safety concerns, with building violations noted in 2002 and 2011 related to fire safety equipment and alarm systems, both of which were eventually abated. A 2005 complaint about low ceiling height in a bedroom and bathroom was resolved, and routine inspections have been conducted periodically.

Recent infrastructure improvements include a completed furnace and duct work installation in June 2024 and a change to 200-amp underground service in 2004, though some permits for electrical work from 2007 are listed as expired. The property has generated multiple 311 calls in recent years, primarily related to street cleaning issues and garbage debris (with several reports in 2023-2024), as well as occasional reports of graffiti and other urban maintenance concerns in the surrounding area. A historical investigation into alleged illegal short-term rental activity was noted in the planning records but was ultimately closed and abated. While the building has seen regular upkeep and modernization efforts, the pattern of withdrawn permit applications for basement unit conversions and the appearance of various maintenance violations suggest ongoing challenges in fully updating the property's infrastructure and compliance systems.

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

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Risk rating

How 3320 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
39th percentile

Out of 1278 buildings in this neighborhood, 780 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
68%
No DBI
violation
32%
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 44.5%
Moderate concern 19.6%
Severe concern 35.9%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

3320 21St St apartment reviews

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The story over time

3320 21St St event timeline

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

2025
Electrical Permit Oct 23
Unit #3: installation of new sub panel and dedicated circuits for a/c unit and air handler
Complete
Electrical PermitOct 23
Unit#2: installation of new sub panel and dedicated circuits for a/c unit and air handler

See all 9 events

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

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Every record we have

Full data for 3320 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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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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