Free SF apartment background check

489 Corbett Ave

Clarendon Heights, SF 94114 2712026 2 units · 2 fl · 1975

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 Clarendon Heights
At or below average
avg 1.5
0
FewerMore

This building has 0 novs (7y), at or below the Clarendon Heights average of 1.5.

Rent & eviction protection

Is 489 Corbett Ave 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 1975
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RH2
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
Units2
Floors2
Year built1975
Total area2,465 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot2712026
Ownership

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

Owner name
Knox Paul Matthew & Yuen Ca
Mailing address
491 Corbett Ave San Francisco CA 94114
Last sale
120318

Landlord portfolio

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

Unlock complete report
Augrented Insights
Initial analysis

The two-family residential building at 489 Corbett Avenue, owned by Knox Paul Matthew & Yuen Ca, was constructed in 1975 in the Clarendon Heights neighborhood. The property has undergone several significant modifications and experienced notable incidents over the years. Most recently, a substantial construction project was proposed in 2021, seeking to add 505 square feet to the fourth floor, along with a 147-square-foot addition to the third floor, new windows, decks, and a staircase connection between floors. This permit remains filed as of October 2023. The building faced a serious incident in July 2016 when a vehicle struck the garage door and entry wall, causing extensive damage that required emergency response from the San Francisco Fire Department and temporary shoring of the garage header. The garage was subsequently repaired in late 2016 at a cost of nearly $10,000.

The property has a history of compliance issues and safety concerns, including an unauthorized fence construction in 2018 that was reported as structurally unstable and cosmetically intrusive, though this violation was eventually abated. Unauthorized plumbing work was also reported and addressed in January 2018. Two minor fire incidents were recorded, involving water/steam leaks and EMS response, neither resulting in civilian injuries. Recent activity at the property has mostly involved external infrastructure issues, with multiple reports of illegal parking and driveway blocking near the property throughout 2024, as well as some graffiti and pavement defects in the vicinity. Building inspections have been regular, with reports from 2022 indicating no unauthorized dwelling unit (UDU) was found during screening. The most recent 311 calls for the property area primarily related to street maintenance and public works rather than building-specific issues, with one ongoing pavement defect case reported in May 2023.

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 489 Corbett Ave'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
98th percentile

Out of 40 buildings in this neighborhood, 1 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
91%
No DBI
violation
9%
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.

Building permits, owner's portfolio

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

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 85.8%
Moderate concern 11.0%
Severe concern 3.2%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

489 Corbett Ave 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

489 Corbett Ave event timeline

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

2026
311 Request Mar 24
Sidewalk defect
lifted sidewalk other

See all 6 events

Full history back to 2021 — violations, complaints, permits, buyouts, and fire incidents.

Unlock complete timeline
Every record we have

Full data for 489 Corbett Ave 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 489 Corbett Ave
Get alerted the moment a new violation or complaint is filed.