200 Polhemus Ave, Atherton, CA 94027 Property Records

San Mateo County property record for 200 Polhemus Ave, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	5 bd · 6 ba · 10,715 sqft · built 1937
Lot Size	2.6 acres (113,591 sqft)
Owner	Company Name on File
Last Sale	$30,050,000 (Oct 2019)
Tax Bill	$360,850 (2025)
Deeds & Mortgages	Oct 2019 Sale
Flood Zone	Zone X (minimal risk)
APN	`070-022-410`

Property Details

APN / Parcel Number

Primary APN	`070-022-410`

Interior

Bedrooms	5 Beds
Full Baths	6 Baths
Total Rooms	15 Rooms
Stories	2 Stories
Building Area	10,715 sqft Living Area
Gross Area	11,867 sqft
1st Floor Area	3,440 sqft
2nd Floor Area	3,400 sqft
Basement Area	2,097 sqft
Finished Basement	1,707 sqft
Unfinished Basement	390 sqft
Family Room	Family Room
Study	Study
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1937
Effective Year Built	Effective 1937
Architectural Style	French
Exterior Material	Brick
Construction Type	Brick
Roof Material	Slate
Lot Area	113,591 sqft
Lot Dimensions	378 ft deep x 300 ft wide
View / Lot	Corner
Garage Type	Attached
Garage Area	762 sqft
Parking Spaces	3 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	200 POLHEMUS AVE
City	ATHERTON
State	CA
Zip	94027-5440
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1001A
Legal Description	2.60 ACS NELY PTN OF LOT 8 POLHEMUS TRACT RSM 2/35 TOWN OF ATHERTON
Legal Subdivision	POLHEMUS TRACT
Legal Lot Number	8
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 · APN 070-022-410

Assessment roll updated July 15, 2026 · Last verified July 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 File
Mailing Address	339 IRIS WAY, PALO ALTO, CA 94303-3042
Owner Type	Company

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Last Sale	Oct 04, 2019 · Amount on Record
Deed Sale	Oct 04, 2019 · Amount on Record
Prior Sale	Aug 10, 2001 · Amount on Record
Deed Document Number	201982716
Prior Transfer Date	Apr 22, 2013
Prior Transfer Doc	0000068079
Record Updated	Sep 20, 2026

October 2019: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Oct 04, 2019
Property Address	200 POLHEMUS AVE, ATHERTON, CA 94027-5440
Document Number	0000082716
Instrument Date	Sep 25, 2019
Instrument	82716
Transaction Type	Transfer
Record Updated	Nov 04, 2019
Title Company	LAWYERS TITLE

Transaction

Amount	Amount Recorded
Tax	$33,055.00
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	339 IRIS WAY PALO ALTO CA 943033042, PALO ALTO, CA 94303-3042

Tax Assessment & Valuation

Source: San Mateo County records · Assessment roll updated July 15, 2026 · Last verified July 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

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

Year	Tax Bill	Assessed Value
2026		$33,521,344 (+2%) Land $25,154,953 Building $8,366,391
2025	$360,850.00 (+1.19%)	$32,864,064 (+4.04%) Land $24,661,719 Building $8,202,345
2024	$356,598.00 (+1.56%)
2023	$351,111.00 (+2.85%)	$31,587,914 Land $23,704,075 Building $7,883,839
2022	$341,395.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, San Mateo County (06081C), as of September 10, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060816114003, as of September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · Last verified October 2026

Flood

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

Wildfire

Wildfire Risk	Low lower than 95% of the US · lower than 97% of California
Wildfire Likelihood	0.01% annual chance
Exposure	None beyond ember reach

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.

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
Race Telecommunications 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 Communications, LLC., Verizon.

Based on FCC filings for 160 locations within half a mile of this property.

Drinking Water

Source: EPA Safe Drinking Water Information System, water system CA4110006, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	CALIFORNIA WATER SERVICE - BEAR GULCH private · serves 60,382 people
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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.