251 Polhemus Ave, Atherton, CA 94027 Property Records

San Mateo County property record for 251 Polhemus Ave, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 3,160 sqft · built 1955
Lot Size	1.24 acres (54,163 sqft)
Owner	Company Name on Record
Last Sale	$10,500,000 (Feb 2024)
Tax Bill	$118,595 (2025)
Deeds & Mortgages	Feb 2024 Sale Nov 2022 Transfer + 3 more
Flood Zone	Zone X (minimal risk)
APN	`070-040-030`

Property Details

APN / Parcel Number

Primary APN	`070-040-030`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	9 Rooms
Building Area	3,160 sqft Living Area
1st Floor Area	2,380 sqft
Family Room	Family Room
Study	Study

Exterior

Year Built	Built 1955
Effective Year Built	Effective 1955
Lot Area	54,163 sqft
Lot Dimensions	295 ft deep x 180 ft wide

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	251 POLHEMUS AVE
City	ATHERTON
State	CA
Zip	94027-5442
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1001A
Legal Description	LOT 3 POLHEMUS PARK RSM 39/36 TOWN OF ATHERTON
Legal Subdivision	POLHEMUS PARK
Legal Lot Number	3
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	3
Census Block	3003
Census Tract	611400

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	100 PINE ST, 2125, SAN FRANCISCO, CA 94111-5225
Owner Type	Company
Vesting	Limited Liability Partnership

Deeds, Mortgages & Sale History

Date	Document
Feb 29, 2024	Grant Deed, Transfer LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY
Nov 23, 2022	Intrafamily Transfer, Transfer
Nov 23, 2022	Intrafamily Transfer, Transfer
Sep 9, 2021	Intrafamily Transfer, Transfer
Apr 6, 2021	Intrafamily Transfer, Transfer

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Feb 29, 2024 · Amount on Record
Deed Sale	Feb 29, 2024 · Amount on Record
Deed Document Number	202411025
Prior Transfer Date	Nov 22, 2022
Prior Transfer Doc	0000082178
Record Updated	Sep 20, 2026

February 2024: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Feb 29, 2024
Property Address	251 POLHEMUS AVE, ATHERTON, CA 94027-5442
Document Number	0000011025
Map Reference	MB 39 PG 36
Instrument Date	Feb 26, 2024
Instrument	2024-011025
Transaction Type	Transfer
Record Updated	Mar 20, 2024
Title Company	LAWYERS TITLE COMPANY/CA, LAWYERS TITLE COMPANY

Transaction

Amount	Amount Recorded
Tax	$11,550.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	100 PINE ST STE 2125, 2125, SAN FRANCISCO, CA 94111-5225
Mail Care Of	REGIS ACQUISITION INC

November 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Nov 23, 2022
Property Address	251 POLHEMUS AVE, ATHERTON, CA 94027-5442
Document Number	0000082178
Map Reference	MB 39 PG 36
Instrument Date	Nov 22, 2022
Instrument	2022-082178
Transaction Type	Transfer
Record Updated	Jun 7, 2023

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
Address	1543 LAUREL PL, MENLO PARK, CA 94025-3123

November 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Nov 23, 2022
Property Address	251 POLHEMUS AVE, ATHERTON, CA 94027-5442
Document Number	0000082177
Map Reference	MB 39 PG 36
Instrument Date	Nov 22, 2022
Instrument	2022-082177
Transaction Type	Transfer
Record Updated	Dec 23, 2022

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
Address	1543 LAUREL PL, MENLO PARK, CA 94025-3123

September 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Sep 9, 2021
Property Address	251 POLHEMUS AVE, ATHERTON, CA 94027-5442
Document Number	0000130304
Map Reference	MB 39 PG 36
Instrument Date	Aug 24, 2021
Instrument	2021-130304
Transaction Type	Transfer
Record Updated	Jun 7, 2023

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
Address	1543 LAUREL PL, MENLO PARK, CA 94025-3123

April 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Apr 6, 2021
Property Address	251 POLHEMUS AVE, ATHERTON, CA 94027-5442
Document Number	0000055062
Map Reference	MB 39 PG 36
Instrument Date	Mar 22, 2021
Instrument	2021-055062
Transaction Type	Transfer
Record Updated	Jun 7, 2023

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
Address	251 POLHEMUS AVE, ATHERTON, CA 94027-5442

Tax Assessment & Valuation

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

Property Jurisdictions

Type	Name
State	California
Municipality	Atherton Town
County	San Mateo County
Elementary School District	Las Lomitas Elementary School District (KG - 08)
Secondary School District	Sequoia Union High School District (09 - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$13,761,776 (+28.49%) Land $10,861,776 Building $2,900,000
2025	$118,595.00 (+2,384.71%)	$10,710,000 (+3,415.76%) Land $10,648,800 Building $61,200
2023	$4,773.00 (+2.87%)	$304,628 Land $116,146 Building $188,482	$4,330,080
2022	$4,640.00

Assessed value is set for property tax purposes, not a market price estimate; it is a fraction of this property's market value.

Flood

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 minimal risk
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 10 policies
Nearby Flood Policies	10 in force
Nearby Flood Claims	1 (2022)
Claims Outside the SFHA	1 of 1
Most Recent Claim	Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides

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

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

Wildfire Risk	Low lower than 95% of the US · lower than 97% of California
Wildfire Likelihood	Under 0.01% annual chance
Exposure	Direct burnable vegetation

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 - BEAR GULCH private · serves 60,382 people · EPA ID CA4110006
Water Source	Surface water
Last State Inspection	Feb 2025
Lead	4 ppb (2022–2024) 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 136 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Race Communications Fiber	10,000 / 10,000
AT&T Fiber · Fixed Wireless, DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20

May also be available: Etheric Networks.

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