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1628-1630 48Th Ave

Outer Sunset, SF 94122 1896038 2 units · 3 fl · 1979

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 Outer Sunset
Above average
avg 1.8
19
FewerMore

This building has 19 novs (7y), above the Outer Sunset average of 1.8.

Rent & eviction protection

Is 1628-1630 48Th 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 1979
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RH2
Not rent-controlled. Buildings constructed after 1978 are generally exempt from SF rent increase limits under the Costa-Hawkins Act.

Based on SF Assessor records. Not legal advice — confirm with the SF Rent Board.

Building characteristics
Units2
Floors3
Year built1979
Total area3,500 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1896038
Ownership

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

Owner name
Yuen Sabina Chrystal
Mailing address
348 Redwood Ave Redwood City CA 94061
Last sale
082720

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.

1628 48th Ave, San Francisco, CA 94122
1630 48th Ave, San Francisco, CA 94122
Augrented Insights
Initial analysis

This three-story multi-family residential building, located at 1628-1630 48th Avenue in San Francisco's Outer Sunset neighborhood, is a duplex property built in 1979 and owned by Sabina Chrystal Yuen. The building has experienced several significant events throughout its history, most notably a series of kitchen fire incidents between late 2015 and early 2016 that required substantial repairs totaling $40,000, including electrical upgrades, sheetrock installation, and kitchen remodel work. The property has a documented history of maintenance and repair work, including a vertical addition completed in 1990, stucco repairs in 2011, and various plumbing and fire safety improvements.

The building's maintenance record includes addressing serious health and safety issues, such as a 2003 plumbing emergency involving sewage problems and subsequent pest infestations, and a 2007 mold issue that reportedly caused breathing problems. The property has also faced some regulatory scrutiny, with a 2014 complaint regarding potential illegal units and suspicious activities, though this case was marked as not active. Recent activity around the property has seen recurring issues with sidewalk parking violations documented through multiple 311 calls in 2024, along with some noise complaints. While there have been three fire complaints on record between 2006 and 2015, two were determined to have no merit and one was resolved with conditions corrected. The building's fire history includes only minor incidents with no civilian injuries reported, specifically a water problem and a smoke scare. In 2017, tenant buyouts were recorded for a neighboring address (1636 48th Avenue), totaling $22,300 for one tenant, though this is unrelated to the current unit's occupancy status.

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

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Risk rating

How 1628-1630 48Th 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
56th percentile

Out of 632 buildings in this neighborhood, 278 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
81%
No DBI
violation
19%
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.

NOV rate, owner's portfolio

Per-building NOV rate across everything this owner manages — high rates signal pattern neglect.

Neighborhood location

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

12-Month severity forecast
No violation 71.6%
Moderate concern 16.2%
Severe concern 12.2%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

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The story over time

1628-1630 48Th Ave event timeline

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

2025
Plumbing Permit Jul 11
Work category: 1m; 40 btus furnace changeout in closet
Complete
Plumbing PermitJul 02
Work category: 1m; 40kbtu furnace c/o in closet.

See all 9 events

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

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Every record we have

Full data for 1628-1630 48Th Ave 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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