Free SF apartment background check

1540-1550 Mason St

North Beach, SF 94133 0148017 6 units · 3 fl · 1914

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 North Beach
At or below average
avg 2.1
0
FewerMore

This building has 0 novs (7y), at or below the North Beach average of 2.1.

Rent & eviction protection

Is 1540-1550 Mason 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 1914
2 or more units
6 units
Property type
Multi-Family Residential
Zoning
RM2
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
Units6
Floors3
Year built1914
Total area5,250 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0148017
Ownership

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

Owner name
Tang Colbert
Mailing address
Tang Rhoda Po Box 591603 San Francisco CA 94159
Last sale
112812

Landlord portfolio

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

Unlock complete report
Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

1542 Mason St, San Francisco, CA 94133
1546 Mason St, San Francisco, CA 94133
1550 Mason St, San Francisco, CA 94133
1540 Mason St, San Francisco, CA 94133
1548 Mason St, San Francisco, CA 94133
1544 Mason St, San Francisco, CA 94133
Augrented Insights
Initial analysis

The 6-unit multi-family residential building at 1540-1550 Mason Street in North Beach, built in 1914 and currently owned by Tang Colbert, has undergone several significant improvements and faced multiple regulatory challenges over its history. Most notably, in late 2022, the building received substantial maintenance attention with the installation of a new skylight and complete reroofing at a combined cost of approximately $8,380. In 2014, two apartment units underwent extensive remodeling including kitchen and bathroom upgrades, electrical work, and the installation of a central heating system (though this permit ultimately expired). The building has a documented history of maintenance issues, with multiple reroofing projects recorded from 1990 through 2022, suggesting ongoing roof maintenance is a priority.

The property has experienced several code compliance issues, particularly regarding fire safety and maintenance. In 2004, violations were recorded concerning egress obstruction and stair repairs, and in 2007, there were problems with damaged walls and ceilings. More recently, in 2015, the building faced multiple violations related to lead paint hazards, including peeling paint requiring remediation and the need for compliance affidavits. The building has undergone regular safety inspections over the years, with a routine inspection in 2015 noting various compliance issues. Residents experienced heating system problems in January 2000, though these were promptly addressed. The property's recent maintenance history shows significant investment in upkeep, particularly in 2022, though the recurrence of lead paint violations in 2015 suggests historical maintenance challenges. The building's location has been subject to typical urban neighborhood issues, as evidenced by 311 calls regarding noise and street cleaning between 2018 and 2022, along with occasional parking-related complaints.

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 1540-1550 Mason 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
54th percentile

Out of 362 buildings in this neighborhood, 167 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
78%
No DBI
violation
22%
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.

Building size

Total floor area — a proxy for building scale and the number of systems (plumbing, electrical, HVAC) that can fail.

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 47.7%
Moderate concern 17.1%
Severe concern 35.2%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

1540-1550 Mason 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
Loading…
The story over time

1540-1550 Mason St event timeline

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

2022
Building Permit Nov 22
Remove existing skylight and install velux new skylight size 40'x40'
$1,580 · Complete
Building PermitNov 22
Reroofing

See all 2 events

Full history back to 2022 — violations, complaints, permits, buyouts, and fire incidents.

Unlock complete timeline
Every record we have

Full data for 1540-1550 Mason St apartments

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

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.

Report Bundle

For the buildings you're deciding on right now

$10 one-time

~$3.33 per building. No subscription ever. Each credit unlocks one building's premium report for 30 days.

  • 3 full AI-powered reports
  • Download PDF reports
  • Advanced safety analysis
  • Compare multiple buildings
  • Credits never expire until you use them
  • Full public records (200 rows per dataset)
Buy 3 Reports — $10

Apartment Hunter

For a wide search across many buildings

$39 one-time

30 reports — ~$1.30 each. No subscription ever.

  • 30 full AI-powered reports
  • Download PDF reports
  • Advanced safety analysis
  • Compare multiple buildings
  • Credits never expire until you use them
  • Full public records (200 rows per dataset)
Buy 30 Reports — $39
Most Popular Current plan

Renter

For the weeks when the stakes are highest

$10/mo

Billed $120/year — save $24 vs monthly

  • Unlimited basic reports
  • 5 premium AI reports per month
  • Download PDF & Excel reports
  • Full public records (200 rows per dataset)
  • Full event timeline — every year of history
  • Landlord portfolio & ownership insights
Start Your Search

Less than $0.34/day. Cancel anytime.

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

Watch 1540-1550 Mason St
Get alerted the moment a new violation or complaint is filed.