Free SF apartment background check

51 Diamond St

Eureka Valley/Dolores Heights, SF 94114 2648030 5 units · 2 fl · 1925

Nothing on record for this building in the last seven years. Our model still sees a moderate chance of maintenance problems in the next 12 months, from the owner's wider portfolio and the surrounding area rather than from anything recorded here. No public enforcement record to go on. Walk the building, ask the current tenants how repairs get handled, and get any promises in writing.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Eureka Valley/Dolores Heights — not a forecast
At or below average
avg 1.4
0
FewerMore

This building has 0 novs (7y), at or below the Eureka Valley/Dolores Heights average of 1.4.

The bar and the rating point different ways because they measure different things: the bar counts DBI violations already on file, the rating forecasts the next 12 months.

Rent & eviction protection

Is 51 Diamond 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 1925
2 or more units
5 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.

Statewide backstop · AB 1482

California Tenant Protection Act of 2019

Even when a building isn't covered by local rent stabilization, the statewide Tenant Protection Act (AB 1482) may still apply. It caps annual rent increases and requires the landlord to state a legal reason to end most tenancies.

15+ years since occupancy
Built 1925
Annual rent increase cap
5% + CPI, max 10%
Just-cause eviction
After 12 months
Local rent control likely takes priority. This building appears to fall under the local ordinance above, which is stronger than AB 1482. Where a local just-cause ordinance applies, its rules govern instead of the state cap.

AB 1482 does not apply to single-family homes and condos unless owned by a corporation, REIT, or an LLC with a corporate member; to owner-occupied duplexes; or to deed-restricted affordable housing. The Act is in effect until January 1, 2030. Not legal advice — see the California landlord–tenant guide.

Building characteristics
Units5
Floors2
Year built1925
Total area4,300 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot2648030
Ownership

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

Mailing address
723 Camino Plaza #177 San Bruno CA 94066
Last sale
—

Landlord portfolio

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

Unlock complete report
Augrented Insights
Initial analysis

The two-story, five-unit apartment building at 51 Diamond Street, owned by George A Poon and Mariasing A L, was constructed in 1925 in the Eureka Valley/Dolores Heights neighborhood. The building has undergone several significant renovations and improvements over the years, with the most notable recent work including a complete kitchen and bathroom renovation in Unit 5 in 2016-2017 ($35,000), and a completed soft-story retrofit in 2016 valued at $50,000, demonstrating compliance with seismic safety requirements. The property has maintained its building systems with a proper 400-amp electrical service upgrade completed in 2009-2010, which included installation of new panels and grounding equipment.

The building has experienced multiple maintenance and compliance issues in its history, with a cluster of violations in 2002-2003 related to fire safety and security (including problems with smoke enclosure doors, stairs, and combustible storage) - though all these violations were abated by June 2003. There were significant plumbing and electrical concerns noted in 1998, including reports of hazardous wiring and water leaks, which appear to have been addressed at that time. More recently, the property has experienced recurring issues with garbage and debris in the vicinity, as evidenced by multiple 311 calls throughout 2023-2024. Additionally, there have been some complaints about building systems, including reports of window air infiltration and appliance issues in 2012, and earlier concerns in 1998 regarding heating and garage usage. The building's most recent fire incident records show only minor incidents, including unintentional alarm activations, with no reported civilian injuries. The property has maintained active compliance with building codes, as evidenced by the completion of required soft-story retrofit work and other permits, though there were some expired permits noted for work in 2016-2017.

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

Free account unlocks the full analysis — plus 2× more records across all data categories and the complete landlord portfolio.
Risk rating

How 51 Diamond 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

Lower risk — safer than most nearby

DBI rarely finds violations here. Strong maintenance history and a clean complaint record.

Typical — about average for the neighborhood

Some past violations or complaints on record. Worth asking the landlord about any open issues before signing.

Higher risk — riskier than most nearby

Elevated violation and complaint history. DBI has found issues here before and is statistically likely to again.

Neighborhood percentile
29thpercentile

Out of 1278 buildings in this neighborhood, 907 are predicted to be safer. The band is relative to this neighborhood, so a share of every neighborhood falls in each colour.

RiskiestSafest
Predicted 12-month outcome
62%
No DBI
violation
38%
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.

Estimated permit spend (past 7 years)

Dollar value of permits pulled at this address — large recent spend can signal deferred-maintenance catch-up.

Owner's portfolio size

Number of SF parcels this owner is registered on — larger portfolios have distinct risk patterns.

12-Month risk forecast
Moderate failure risk 38%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

51 Diamond St apartment reviews

Real experiences from people who have lived here. Share yours to help other renters decide.

Share your experience — Help other renters by leaving an honest apartment review

Create account

Loading reviews…

On the map

Compare nearby alternatives

This building and nearby alternatives, color-coded by risk level. Click any marker to explore.

Buildings nearby
8 found
The story over time

51 Diamond St event timeline

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

2026
311 Request Jul 29
Garbage and debris
other loose garbage debris yard waste

See all 5 events

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

Unlock complete timeline
Every record we have

Full data for 51 Diamond St apartments

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

Side by side

How 51 Diamond St compares to the neighborhood

This building against comparable properties in Eureka Valley/Dolores Heights. Toggle filters to narrow the peer group.

Loading comparables…
Still apartment hunting in SF?

Look up the next apartment before you sign

Search any SF address free — no account needed to see the risk rating.

Search another address Get full report
Simple pricing

Get the complete picture

Every plan unlocks the complete report: all 13 SF datasets, full history, landlord portfolio, and PDF & Excel exports.

Pay once

Report Bundle

For the buildings you're deciding on right now

$10one time

3premium reports

$3.33 per report · charged once, never renews

Each credit unlocks one building's premium report for 30 days.

  • 3 premium reports — AI executive summary included
  • Live data across all 27 public record types
  • 200 records per dataset
  • PDF & Excel exports included
  • Compare up to 10 buildings side-by-side
  • Credits never expire until you use them
Buy 3 Reports — $10
Pay once

Apartment Hunter

For a wide search across many buildings

$39one time

30premium reports

$1.30 per report · charged once, never renews

Each credit unlocks one building's premium report for 30 days.

  • 30 premium reports — AI executive summary included
  • Live data across all 27 public record types
  • 200 records per dataset
  • PDF & Excel exports included
  • Compare up to 10 buildings side-by-side
  • Credits never expire until you use them
Buy 30 Reports — $39
Most Popular Current plan
Subscription

Renter

For the weeks when the stakes are highest

$8.33/mo

5premium reports / mo

Billed $100/year — save $44 vs monthly

Renews automatically until you cancel.

  • Unlimited standard reports — 50 records per dataset
  • 5 premium AI reports per month — live data, 200 records per dataset, all 27 record types
  • PDF & Excel exports on every report
  • Compare up to 10 buildings side-by-side
  • Full event timeline — every year of history
  • Landlord portfolio & ownership insights
Start Your Search

Less than $0.28/day. Cancel anytime.

Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

Watch 51 Diamond St
Get alerted the moment a new violation or complaint is filed.