245 Polhemus Ave, Atherton, CA 94027 Property Records

San Mateo County property record for 245 Polhemus Ave, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	3 bd · 3.5 ba · 5,520 sqft · built 1998
Lot Size	1.1 acres (48,055 sqft)
Owner	Company Name on Record
Last Sale	$13,150,000 (Sep 2019)
Tax Bill	$158,742 (2025)
Deeds & Mortgages	Sep 2019 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`070-040-060`

Property Details

APN / Parcel Number

Primary APN	`070-040-060`

Interior

Bedrooms	3 Beds
Full Baths	3.5 Baths
Half Baths	1 Half Bath
Total Rooms	9 Rooms
Stories	1 Story
Building Area	5,520 sqft Living Area
1st Floor Area	5,520 sqft
Family Room	Family Room
Study	Study

Exterior

Year Built	Built 1998
Effective Year Built	Effective 1998
Lot Area	48,055 sqft
Lot Dimensions	299 ft deep x 165 ft wide
Parking Spaces	4 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	245 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 2 POLHEMUS PARK NO 2 RSM 47/26 TOWN OF ATHERTON
Legal Subdivision	POLHEMUS PARK NO 2
Legal Lot Number	2
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	575 MARKET ST, 2700, SAN FRANCISCO, CA 94105-2879
Owner Type	Company

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Sep 27, 2019 · Amount on Record
Deed Sale	Sep 27, 2019 · Amount on Record
Prior Sale	Jul 26, 1996 · Amount on Record
Deed Document Number	201980135
Prior Transfer Date	Dec 17, 2012
Prior Transfer Doc	0000193583
Record Updated	Sep 20, 2026

September 2019: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Sep 27, 2019
Property Address	245 POLHEMUS AVE, ATHERTON, CA 94027-5442
Document Number	0000080135
Map Reference	MB 47 PG 26
Instrument Date	Sep 19, 2019
Instrument	2019-080135
Transaction Type	Transfer
Record Updated	Aug 9, 2021
Title Company	LAWYERS TITLE COMPANY

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	575 MARKET ST STE 2700, 2700, SAN FRANCISCO, CA 94105-2879

Mortgage

Document Number	0000080136
Date	Sep 27, 2019
Instrument	2019-080136

Lender

Name	BNY MELLON NA
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Oct 1, 2049

Interest

Rate Type	Adjustable Rate
Rate	2.87%
Type Change Date	Oct 1, 2024
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	4.87%
Index	1-Year LIBOR
Max Rate	7.87%

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		$14,669,073 (+2%) Land $11,322,518 Building $3,346,555
2025	$158,742.00 (+1.2%)	$14,381,445 (+4.04%) Land $11,100,508 Building $3,280,937
2024	$156,859.00 (+1.57%)
2023	$154,435.00 (+2.85%)	$13,822,997 Land $10,669,462 Building $3,153,535
2022	$150,161.00

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 96% of the US · lower than 97.4% of California
Wildfire Likelihood	Under 0.01% annual chance
Exposure	None beyond 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 - 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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