521 3rd Ave, San Bruno, CA 94066 Property Records

San Mateo County property record for 521 3rd Ave, San Bruno, CA 94066

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,320 sqft · built 1941
Lot Size	0.115 acres (5,000 sqft)
Owner	2 Individual Names on File
Tax Bill	$3,787 (2025)
Deeds & Mortgages	Feb 2021 Transfer Apr 2020 Mortgage
Flood Zone	Zone X (moderate risk)
APN	`020-205-110`

Property Details

APN / Parcel Number

Primary APN	`020-205-110`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,320 sqft Living Area
1st Floor Area	870 sqft
Family Room	Family Room

Exterior

Year Built	Built 1941
Effective Year Built	Effective 1941
Lot Area	5,000 sqft (0.115 acres)
Lot Dimensions	100 ft deep x 50 ft wide
Garage Area	200 sqft
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	521 3RD AVE
City	SAN BRUNO
State	CA
Zip	94066-4507
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R10006
Legal Description	LOTS 33 & 34 BLOCK 26 BELLE AIR PARK RSM 5/10
Legal Subdivision	BELLE AIR PARK
Legal Block	26
Legal Lot Number	33,34
Jurisdiction	SAN MATEO CA
Township / Civil Division	SOUTH SAN FRANCISCO
Census Block Group	3
Census Block	3017
Census Tract	604200

Owner

521 3rd Ave is owned and occupied by two individuals who acquired it in October 2020.

Source: San Mateo County records, as of July 15, 2026

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	2 Individual Names on File
Mailing Address	521 3RD AVE, SAN BRUNO, CA 94066-4507
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Feb 12, 2021	Intrafamily Transfer, Transfer
Apr 30, 2020	Quit Claim Deed, Transfer SUPREME LNDG

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Transfer Date	Oct 20, 2020
Transfer Doc	0000024280
Record Updated	Oct 29, 2026

February 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Feb 12, 2021
Property Address	521 3RD AVE, SAN BRUNO, CA 94066-4507
Document Number	0000024280
Map Reference	MB 5 PG 10
Instrument Date	Oct 20, 2020
Instrument	2021-024280
Transaction Type	Transfer
Record Updated	Aug 9, 2021

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Tenants in Common
Address	725 3RD AVE, SAN BRUNO, CA 94066-3617

April 2020: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SAN MATEO CA
Recording Date	Apr 30, 2020
Property Address	521 3RD AVE, SAN BRUNO, CA 94066-4507
Document Number	0000038881
Instrument Date	Apr 24, 2020
Instrument	38881
Transaction Type	Transfer
Record Updated	May 27, 2020
Title Company	STEWART TITLE, STEWART TITLE/CA

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	521 3RD AVE SAN BRUNO CA 940664507, SAN BRUNO, CA 94066-4507

Mortgage

Document Number	38882
Date	Apr 30, 2020
Instrument	38882

Lender

Name	SUPREME LNDG
Address	DALLAS, TX 75254

Agreement

Amount	Amount on Record
Term	360 Months
Due	Apr 29, 2050

Tax Assessment & Valuation

The 2025 property tax bill for 521 3rd Ave was $3,787 with a homeowner's exemption, up 12.5% from the year before.

Source: San Mateo County assessment roll, as of July 15, 2026

Property Jurisdictions

Type	Name
State	California
County	San Mateo County
Municipality	San Bruno City
Elementary School District	San Bruno Park Elementary School District (KG - 08)
Secondary School District	San Mateo Union High School District (09 - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$266,663 (+2%) Land $126,775 Building $139,888
2025	$3,787.00 (+12.51%) Homeowner's exemption	$261,436 Land $124,290 Building $137,146
2024	$3,366.00 (+22.09%)
2023	$2,757.00 (+1.21%) Homeowner's exemption	$251,286 Land $119,464 Building $131,822	$1,031,670
2022	$2,724.00

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 521 3rd Ave in Zone X, an area of moderate flood risk, within 100 ft of a high-risk flood zone.

Source: FEMA National Flood Hazard Layer, effective September 10, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X moderate risk
500-Year Floodplain	Yes 0.2% annual chance
Nearest Special Flood Hazard Area	Zone AE, within 100 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on File median of 110 policies
Nearby Flood Policies	110 in force
Nearby Flood Claims	12 (1980–2022)
Most Recent Claim	Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Winter Storms, Flooding, Landslides, And Mudslides, Dec 2022 · 3 claims Severe Storms, Flood, Mudslides & High Tide, Jan 1982 · 3 claims

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

The area around 521 3rd Ave has no burnable land within ember reach, so its wildfire risk is not rated.

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Not rated no burnable land within ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	CITY OF SAN BRUNO serves 42,631 people · EPA ID CA4110023
Water Source	Purchased surface water from several systems
Last State Inspection	Jul 2024
Lead	Under 1 ppb (2023–2025) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	None last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 611 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · Fixed Wireless, DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	1,000 / 75
Etheric Networks Fixed Wireless	250 / 100
T-Mobile Fixed Wireless	100 / 20

May also be available: GeoLinks.

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