243 Polhemus Ave, Atherton, CA 94027 Property Records

San Mateo County property record for 243 Polhemus Ave, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	5 bd · 4.5 ba · 4,810 sqft · built 1970
Lot Size	1.04 acres (45,551 sqft)
Owner	Company Name on Record
Last Sale	$9,965,000 (Dec 2020)
Tax Bill	$119,431 (2025)
Deeds & Mortgages	Aug 2017 Mortgage Dec 2020 Sale
Flood Zone	Zone X (minimal risk)
APN	`070-040-070`

Property Details

APN / Parcel Number

Primary APN	`070-040-070`

Interior

Bedrooms	5 Beds
Full Baths	4.5 Baths
Half Baths	1 Half Bath
Total Rooms	12 Rooms
Stories	2 Stories
Building Area	4,810 sqft Living Area
Gross Area	6,260 sqft
1st Floor Area	2,410 sqft
2nd Floor Area	1,920 sqft
Family Room	Family Room
Study	Study
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1970
Effective Year Built	Effective 1970
Lot Area	45,551 sqft
Lot Dimensions	277 ft deep x 165 ft wide
View / Lot	Corner
Garage Type	Attached
Garage Area	1,450 sqft
Parking Spaces	5 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	243 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 4 POLHEMUS PARK NO 2 RSM 47/26 TOWN OF ATHERTON
Legal Subdivision	POLHEMUS PARK NO 2
Legal Lot Number	4
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 August 6, 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	1801 PAGE MILL RD, 100, PALO ALTO, CA 94304-1216
Owner Type	Company

Deeds, Mortgages & Sale History

Date	Document
Aug 21, 2017	Deed of Trust, Mortgage · ARM CITIBANK NA
Dec 31, 2020	Grant Deed, Transfer FIRST AMERICAN TITLE

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Dec 31, 2020 · Amount on Record
Deed Sale	Dec 31, 2020 · Amount on Record
Deed Document Number	2020154982
Prior Transfer Date	Sep 13, 2011
Prior Transfer Doc	0000108674
Record Updated	Sep 20, 2026

August 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	243 POLHEMUS AVE, ATHERTON, CA 94027-5442
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	TICOR TITLE ORANGE COUNTY

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000072739
Date	Aug 21, 2017
Instrument	2017-072739

Lender

Name	CITIBANK NA
Type	Bank
Address	O FALLON, MO 63368

Agreement

Type	ARM
Amount	Amount Recorded
Term	361 Months
Due	Sep 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	2.75%
Adjustable	Adjustable Rate Rider
Type Change Date	Sep 1, 2024
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	7.75%
Index	1-Year LIBOR
Max Rate	7.75%

December 2020: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Dec 31, 2020
Property Address	243 POLHEMUS AVE, ATHERTON, CA 94027-5442
Document Number	0000154982
Instrument Date	Dec 22, 2020
Instrument	154982
Transaction Type	Transfer
Record Updated	Feb 8, 2021
Title Company	FIRST AMERICAN TITLE

Transaction

Amount	Amount Recorded
Tax	$10,962.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	1801 PAGE MILL RD #100 PALO ALTO CA 943041216, 100, PALO ALTO, CA 94304-1216

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		$11,002,163 (+2%) Land $10,930,399 Building $71,764
2025	$119,431.00 (+1.21%)	$10,786,435 (+4.04%) Land $10,716,078 Building $70,357
2024	$118,008.00 (+1.57%)
2023	$116,180.00 (+2.85%)	$10,367,586 Land $10,299,960 Building $67,626
2022	$112,965.00

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	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.

Nearby Properties on Polhemus Ave

Nearby Streets

Search Property Records by Address or Parcel Number

Search by:

By searching, you agree to: Terms • Privacy • Disclosures