509 E 4th Ave, San Mateo, CA 94401 Property Records

San Mateo County property record for 509 E 4th Ave, San Mateo, CA 94401

Property Summary

Property Type	Vacant Land
Details	7,448 sqft · built 1950
Lot Size	0.187 acres (8,140 sqft)
Owner	Company Name on Record
Last Sale	$9,000,000 (Jul 2022)
Tax Bill	$108,446 (2025)
Deeds & Mortgages	Aug 2022 Mortgage Jul 2022 Sale + 4 more
Flood Zone	Zone X (minimal risk)
APN	`034-185-150`

Property Details

APN / Parcel Number

Primary APN	`034-185-150`

Interior

Stories	1 Story
Building Area	7,448 sqft Gross Area
1st Floor Area	7,448 sqft

Exterior

Year Built	Built 1950
Effective Year Built	Effective 1950
Fire Resistance	Wood or Wood & Steel Frame
Lot Area	8,140 sqft (0.187 acres)

Location & Zoning

Street Address	509 E 4TH AVE
City	SAN MATEO
State	CA
Zip	94401-3312
Property Category	Vacant Land
Property Type	Vacant Land > Uncategorized
Local Zoning Code	CH00C4
Legal Description	LOT 12 & SELY 24 FT OF LOT 11 BLK 21 TOWN OF SAN MATEO RSM 1/45
Legal Subdivision	TOWN OF SAN MATEO
Legal Block	21
Legal Lot Number	12,11
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	2
Census Block	2007
Census Tract	606300

Owner

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

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	Company Name on Record
Mailing Address	530 EMERSON ST, 150, PALO ALTO, CA 94301-1607
Owner Type	Company
Vesting	Limited Liability Company

Deeds, Mortgages & Sale History

Date	Document
Aug 2, 2022	Deed of Trust, Mortgage · Commercial Mortgage ACORE CAPITAL MORTGAGE LP
Jul 29, 2022	Grant Deed, Transfer FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY
Apr 29, 2021	Deed of Trust, Mortgage · Commercial Mortgage BANK OF THE ORIENT
Apr 29, 2021	Deed of Trust, Mortgage · Commercial Mortgage BANK OF THE ORIENT
Feb 19, 2020	Quit Claim Deed, Transfer NOT AVAILABLE
Jan 10, 2017	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jul 29, 2022 · Amount on Record
Deed Sale	Jul 29, 2022 · Amount on Record
Prior Sale	Jun 30, 2010 · Amount on Record
Deed Document Number	202257750
Prior Transfer Date	Dec 30, 2016
Prior Transfer Doc	0000002376
Record Updated	Oct 29, 2026

August 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	509 E 4TH AVE, SAN MATEO, CA 94401-3312
Transaction Type	Mortgage
Record Updated	Aug 25, 2022
Title Company	FIRST AMER TTL INS CO NATL C

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000058280
Date	Aug 2, 2022
Instrument	2022-058280

Lender

Name	ACORE CAPITAL MORTGAGE LP
Type	Non-Lending Institution
Address	LARKSPUR, CA 94939

Agreement

Type	Commercial Mortgage
Amount	Amount Recorded

July 2022: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Jul 29, 2022
Property Address	509 E 4TH AVE, SAN MATEO, CA 94401-3312
Document Number	0000057750
Map Reference	MB 1 PG 45
Instrument Date	Jul 27, 2022
Instrument	2022-057750
Transaction Type	Transfer
Record Updated	Aug 23, 2022
Title Company	FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY

Transaction

Amount	Amount Recorded
Tax	$54,900.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	530 EMERSON ST # 150, 150, PALO ALTO, CA 94301-1607
Investor	Possibly a Property Investor

April 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	509 E 4TH AVE, SAN MATEO, CA 94401-3312
Transaction Type	Mortgage
Record Updated	Aug 9, 2021
Title Company	CHICAGO TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	674 23RD AVE, SAN FRANCISCO, CA 94121-3709

Mortgage

Document Number	0000068569
Date	Apr 29, 2021
Instrument	2021-068569

Lender

Name	BANK OF THE ORIENT
Type	Bank
Address	SAN FRANCISCO, CA 94111

Agreement

Type	Commercial Mortgage
Amount	Amount Recorded

April 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	509 E 4TH AVE, SAN MATEO, CA 94401-3312
Transaction Type	Mortgage
Record Updated	Aug 9, 2021
Title Company	CHICAGO TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	674 23RD AVE, SAN FRANCISCO, CA 94121-3709

Mortgage

Document Number	0000068568
Date	Apr 29, 2021
Instrument	2021-068568

Lender

Name	BANK OF THE ORIENT
Type	Bank
Address	SAN FRANCISCO, CA 94111

Agreement

Type	Commercial Mortgage
Amount	Amount Recorded

February 2020: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SAN MATEO CA
Recording Date	Feb 19, 2020
Property Address	509 E 4TH AVE, SAN MATEO, CA 94401-3312
Document Number	0000014072
Instrument Date	Sep 23, 2019
Instrument	14072
Transaction Type	Transfer
Record Updated	Mar 13, 2020
Title Company	NOT AVAILABLE

Transaction

Tax	$0.00
Additional	Quitclaim Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	674 23RD AVE SAN FRANCISCO CA 941213709, SAN FRANCISCO, CA 94121-3709

January 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SAN MATEO CA
Recording Date	Jan 10, 2017
Property Address	509 E 4TH AVE, SAN MATEO, CA 94401-3312
Document Number	0000002376
Instrument Date	Dec 30, 2016
Instrument	2376
Transaction Type	Transfer
Record Updated	Jan 24, 2017
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	674-23RD AVE SAN FRANCISCO CA 94121, SAN FRANCISCO, CA 94121

Tax Assessment & Valuation

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

Property Jurisdictions

Type	Name
State	California
County	San Mateo County
Municipality	San Mateo City
Elementary School District	San Mateo-Foster City 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
2026		$9,540,259 (+2%) Land $9,540,259
2025	$108,446.00 (+1.28%)	$9,353,196 (+3.92%) Land $9,353,196
2024	$107,075.00 (+4.13%)
2023	$102,827.00 (+111.15%)	$9,000,000 Land $8,990,000 Building $10,000
2022	$48,698.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

Source: FEMA National Flood Hazard Layer, effective September 10, 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Values are read at the parcel center point; lenders make the official flood determination.

Wildfire

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	CALIFORNIA WATER SERVICE - SAN MATEO private · serves 103,536 people · EPA ID CA4110008
Water Source	Purchased surface water from SAN FRANCISCO REGIONAL WATER SYSTEM
Last State Inspection	Mar 2025
Lead	4 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 791 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
Astound Broadband Cable · Fiber in parts of the area	1,500 / 50
Sonic Telecom Fiber	1,000 / 1,000
Verizon Fixed Wireless	1,000 / 75
Unwired Fixed Wireless	300 / 25
Etheric Networks Fixed Wireless	250 / 100

May also be available: GeoLinks, T-Mobile.

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