234 Polhemus Ave, Atherton, CA 94027 Property Records

San Mateo County property record for 234 Polhemus Ave, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	5 bd · 5.5 ba · 6,750 sqft · built 1985
Lot Size	1.29 acres (56,483 sqft)
Owner	2 Company Names on Record
Last Sale	$13,000,000 (May 2021)
Tax Bill	$155,354 (2025)
Deeds & Mortgages	Jul 2021 Mortgage May 2021 Sale
Flood Zone	Zone X (minimal risk)
APN	`070-022-460`

Property Details

APN / Parcel Number

Primary APN	`070-022-460`

Interior

Bedrooms	5 Beds
Full Baths	5.5 Baths
Half Baths	1 Half Bath
Total Rooms	13 Rooms
Stories	2 Stories
Building Area	6,750 sqft Living Area
1st Floor Area	5,150 sqft
2nd Floor Area	1,440 sqft
Family Room	Family Room
Study	Study
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1985
Effective Year Built	Effective 1985
Architectural Style	Tudor
Exterior Material	Wood Siding
Construction Type	Frame
Roof Material	Wood Shingle
Lot Area	56,483 sqft
Lot Dimensions	215 ft deep x 259 ft wide
Garage Area	800 sqft
Parking Spaces	3 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	234 POLHEMUS AVE
City	ATHERTON
State	CA
Zip	94027-5439
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1001A
Legal Description	LOT 6 POLHEMUS ESTATES RSM 46/42 TOWN OF ATHERTON
Legal Subdivision	POLHEMUS ESTATES
Legal Lot Number	6
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	3
Census Block	3000
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	2 Company Names on Record
Mailing Address	234 POLHEMUS AVE, ATHERTON, CA 94027-5439
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Jul 27, 2021	Deed of Trust, Mortgage · Conventional Mortgage MORGAN STANLEY PRIVATE BANK NA
May 12, 2021	Grant Deed, Transfer CHICAGO TITLE COMPANY

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 12, 2021 · Amount on Record
Deed Sale	May 12, 2021 · Amount on Record
Prior Sale	Dec 16, 2016 · Amount on Record
Deed Document Number	202175504
Prior Transfer Date	Nov 18, 2004
Prior Transfer Doc	0000237356
Record Updated	Oct 29, 2026

July 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	234 POLHEMUS AVE, ATHERTON, CA 94027-5439
Transaction Type	Mortgage
Record Updated	Jun 8, 2026
Title Company	BOSTON NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	1 DOUGLASS WAY, ATHERTON, CA 94027-4113

Mortgage

Document Number	0000110528
Date	Jul 27, 2021
Instrument	2021-110528

Lender

Name	MORGAN STANLEY PRIVATE BANK NA
Type	Bank
Address	CINCINNATI, OH 45245

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Aug 1, 2051

May 2021: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	May 12, 2021
Property Address	234 POLHEMUS AVE, ATHERTON, CA 94027-5439
Document Number	0000075504
Map Reference	MB 46 PG 42
Instrument Date	Apr 21, 2021
Instrument	2021-075504
Transaction Type	Transfer
Record Updated	Jun 7, 2023
Title Company	CHICAGO TITLE COMPANY

Transaction

Amount	Amount Recorded
Tax	$14,300.00
Amount Accuracy	Calculated from Transfer Tax
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	234 POLHEMUS AVE, ATHERTON, CA 94027-5439

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
2026		$14,353,048 (+2%) Land $13,248,968 Building $1,104,080
2025	$155,354.00 (+2.79%)	$14,071,617 (+4.04%) Land $12,989,185 Building $1,082,432
2023	$151,138.00 (+2.85%)	$13,525,200 Land $12,484,800 Building $1,040,400
2022	$146,955.00

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 · 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	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 160 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 in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250

May also be available: Etheric Networks, Verizon.

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