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Building and Landlord Data Analysis Report

1490 21st Ave, San Francisco, CA 94122

5
Complaints
0
Fire Incidents
63
311 Calls
0
Permits

Risk Assessment

20
High Risk

This building is in the riskiest 10% of buildings in Presidio Heights with significant maintenance issues.

Our AI predicts there is a 20% chance of no major maintenance issues.
Augrented Insights Report

The 5-unit, 2-story multi-family residential building at 1490 21st Avenue in the Central Sunset neighborhood, owned by the Mary Yan Ow Living Trust, has experienced ongoing maintenance and habitability issues over the past several years. Most notably, there have been persistent problems with moisture and mold, particularly in 2019-2023, with multiple tenant complaints regarding window sealing issues, bathroom ventilation problems, and water damage affecting both interior surfaces and mechanical systems. The building underwent some significant maintenance work in recent years, including a gas furnace replacement in 2018, electrical meter socket replacement in 2014, and a complete reroofing in 1992.

A routine housing inspection in September 2018 revealed several violations that were not fully abated until September 2021, including issues with mold, weather proofing, fire safety equipment, gas vent terminations, and forced air units. More recent concerns include a December 2023 complaint about lack of hot water and a 2024 fire alarm system issue that was corrected by the end of January 2024. The building's maintenance history shows some attention to infrastructure updates, though the frequency and nature of habitability complaints suggest ongoing challenges with building systems and moisture control.

Recent records also indicate parking enforcement issues in the surrounding area, with multiple citations issued in 2024, and there was a flooding incident reported in July 2024. In terms of historical maintenance, the property has received periodic attention to critical systems, including the replacement of the gas furnace in 2018 and electrical upgrades in 2014. The building's history of violations, particularly those related to moisture control, fire safety, and mechanical systems, suggests these areas have required particular attention over time. The property also experienced one cooking-related fire incident and a carbon monoxide detector activation (both with no injuries) in 2009 and 2023 respectively.

Last updated: January 17, 2025
This report is created with AI and based on the most recent 10 data items in each category. Full reports with 50+ data points are available to subscribers.

1490 21st Ave Report Contents

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Building Overview

Renter Risk Rating

This building is in the riskiest 10% of buildings in Central Sunset.

Building Characteristics

Total units 5
Year built 1972
Total area 6155 sq ft
Floors 2
Tax Abatements None
Building Class A5 - Apartment 5 to 14 Units
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Key Building Statistics

5
Building Complaints
Number of complaints filed with the Department of Building Inspection in the last 7 years.
16
Code Violations
Building code violations issued by DBI in the last 7 years.
0
Fire Incidents
Total number of fire incidents reported at this building.
1
DBI Director Hearings
Number of Director's Hearings held by DBI in the last 7 years.
63
311 Calls
Number of 311 calls for this building.
0
Fire Injuries
Number of fire injuries reported by SFFD.
0
Building Permits
Number of building permits issued by DBI.

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Reviews of 1490 21st Ave

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1490 21st Ave Landlord Information

Ownership Data

Ownership data from the Secured Roll (property tax) provided by the SF Assessor-Recorder.

NameAddress
Mary Yan Ow Lvg TrOw Mary Yan Ttee 880 Meridian Bay Ln #321 Foster City CA 94404

Landlord Portfolio

We cross-reference landlords' property tax registrations to find the other buildings they own or manage.

AddressUnitsCode ViolationsRisk Rating
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Landlord Court Records

From CA Court Service & DocketAlarm. Note: name matching only, verify parties are actually the owners by reviewing the case files!

Date FiledCase TitleCourtLink
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1490 21st Ave Rent Control Status

Year Built
Built before 1979
Units
More than 1 unit
Rent Board Registration
Not applicable
Additional Info
N/A
Year BuiltUnitsRent Board RegistrationAdditional Info
Before 1979 >1 unit N/A N/A

Full Building Data for 1490 21st Ave

311 Housing Complaints

The table below shows the 311 housing complaints received regarding the conditions at 1490 21st Ave, as well as requests for service nearby.

OpenedCategoryResponsible AgencyRequest TypeRequest DetailsStatus
2025-07-29 15:45:49+00:00 Parking Enforcement MTA - Parking Enforcement Dispatchblocking_driveway_cite_onlyNone Closed
2025-07-26 06:37:47+00:00 Street and Sidewalk Cleaning PW - Street and Environmental Servicesgarbage_and_debrishuman_waste_or_urine Closed
2025-07-25 15:14:17+00:00 Street and Sidewalk Cleaning Recology - Abandonedgarbage_and_debrisother_bagged_boxed_contained_garbage Closed
2025-07-24 19:08:28+00:00 General Request MTA - Parking Enforcementmunicipal_transportation_agencyparking_enforcement customer_callback Open
2025-07-24 13:13:45+00:00 Parking Enforcement MTA - Parking Enforcement Dispatchblocking_driveway_cite_onlyNone Closed
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DBI Complaints

Complaints received by the Department of Building Inspection.

Date FiledDate AbatedAssigned DivisionComplaint DescriptionStatusLink
2023-12-11 00:00:00+00:00NoneHousing Inspection ServicesNo hot water since 12/08 Not Active View on DBI
2020-02-14 00:00:00+00:00NoneHousing Inspection ServicesMain window is not closing properly and air infiltration to cause mold in the room. Not Active View on DBI
2019-11-22 00:00:00+00:00NoneBuilding Inspection DivisionDate last observed: 21-nov-19; time last observed: 9:05am; floor: 1; unit: 1; exact location: main bldg; building type: residence/dwelling mold; other housing; ; additional information: windows do not properly seal resulting in mold growth throughout apartment; Not Active View on DBI
2019-05-31 00:00:00+00:00NoneHousing Inspection ServicesDate last observed: 30-may-19; floor: 1; unit: 1; exact location: main bldg; building type: residence/dwelling mold; flues/vents defective; ; additional information: bathrooms have no windows or vents, and the ceiling fan does not work. this results in moisture and mold every time we shower. ; Not Active View on DBI
2018-09-13 00:00:00+00:002021-09-15 00:00:00+00:00Housing Inspection ServicesRoutine inspection initiated by cts 201890841 Not Active View on DBI
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DBI Violations

Building code violations records.

Date FiledDate AbatedItemViolation DescriptionStatus
2018-09-13T00:00:00.000Z provide fire extinguisher type 2a 10bc or equivalent.(905, 1001(n)hc) at each level of the building in the common area, visible and readily accessible from the path of egress, provide approved fire extinguishers with current inspection date tags. one extinguisher at each landing, and one extinguisher in the garage will fulfill this requirement (4 extinguishers) fire sectionnot active
2018-09-13T00:00:00.000Z building permit required (301 hc) in the garage, partitions have been built that separate the garage which opens on to 21st avenue from the garages which open on to kirkham. have a licensed general contractor obtain permits, and, using approved methods and materials, make changes to the installation so that the walls meet all applicable codes, or remove the walls. in either case, completed building permits are required. *completed building permits required* building sectionnot active
2018-09-13T00:00:00.000Z repair electrical light (1001e hc) on the roof, the light fixture mounted to the outside of the penthouse is hanging by it's conductors. have a qualified professional, using approved methods and materials, repair the fixture so that it works and there are no exposed conductors. plumbing and electrical sectionnot active
2018-09-13T00:00:00.000Z remove egress obstruction at (801,1001(l) hc) at the penthouse landing (roof access door landing), there is stored furniture. remove the furniture. fire sectionnot active
2018-09-13T00:00:00.000Z this notice includes violations for the areas noted. 1490 21st av , common areas building sectionnot active
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Fire Violations

Fire code violations recorded by the San Francisco Fire Department.

Violation DateDisposition DateAddressViolation DescriptionStatus
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Fire Incidents

Historical fire incident records for the property.

Incident DatePrimary SituationIgnition CauseCivilian Injuries
2024-04-25 00:00:00+00:00746 Carbon monoxide detector activation, no CONone0
2023-04-09 00:00:00+00:00113 Cooking fire, confined to containerNone0
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Building Permits

Permit records for 1490 21st Ave.

Permit Creation DateEstimated CostDescriptionStatusPermit Number
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Electrical Permits

Electrical system permits for the building.

Application DateDescriptionStatusPermit Number
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Plumbing Permits

Plumbing system permits for the building.

Application DateDescriptionStatusPermit Number
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Planning Records

Planning records for the property.

DateProject AddressDescriptionApplicant
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Tenant Buyouts

Tenant buyout records for the property.

BlocklotAddressAgreement DateAmountTenants
18330151495 21st Avenue2024-12-03 00:00:00+00:0065000.01
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How 1490 21st Ave Compares

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