450 Middlefield Rd, Atherton, CA 94027 Property Records

San Mateo County property record for 450 Middlefield Rd, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	6 bd · 7.5 ba · 6,620 sqft · built 2000
Lot Size	1.15 acres (50,415 sqft)
Owner	2 Company Names on Record
Last Sale	$4,350,000 (Jul 2009)
Tax Bill	$64,229 (2025)
Deeds & Mortgages	May 2022 Mortgage Aug 2018 Line of Credit
Flood Zone	Zone X (minimal risk)
APN	`061-360-170`

Property Details

APN / Parcel Number

Primary APN	`061-360-170`

Interior

Bedrooms	6 Beds
Full Baths	7.5 Baths
Half Baths	1 Half Bath
Total Rooms	12 Rooms
Stories	2 Stories
Building Area	6,620 sqft Living Area
1st Floor Area	4,350 sqft
2nd Floor Area	2,270 sqft
Family Room	Family Room
Study	Study
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 2000
Effective Year Built	Effective 2000
Roof Material	Wood Shingle
Lot Area	50,415 sqft
Lot Dimensions	320 ft deep x 157 ft wide
Garage Area	1,530 sqft
Parking Spaces	6 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	450 MIDDLEFIELD RD
City	ATHERTON
State	CA
Zip	94027-3216
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R10000
Legal Description	1.157 AC MOL PARCEL 2 PARCEL MAP VOL 28/40
Legal Subdivision	SUBDIVISION LOT D CHAS GOODALL ESTATE
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	1
Census Block	1005
Census Tract	611500

Owner

Source: San Mateo County records, as of July 15, 2026

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	2 Company Names on Record
Mailing Address	450 MIDDLEFIELD RD, ATHERTON, CA 94027-3216
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
May 10, 2022	Deed of Trust, Mortgage · Conventional Mortgage WELLS FARGO BANK NA
Aug 14, 2018	Intrafamily Transfer, Transfer · Line of Credit FIRST REPUBLIC BANK

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Jul 30, 2009 · Amount on Record
Deed Sale	Jul 30, 2009 · Amount on Record
Prior Sale	May 16, 2006 · Amount on Record
Deed Document Number	2009102618
Last Transfer Date	Aug 8, 2018
Transfer Doc	0000063392
Record Updated	Oct 29, 2026

May 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	450 MIDDLEFIELD RD, ATHERTON, CA 94027-3216
Transaction Type	Mortgage
Record Updated	Aug 5, 2022
Title Company	CHICAGO TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	450 MIDDLEFIELD RD, ATHERTON, CA 94027-3216

Mortgage

Document Number	0000038942
Date	May 10, 2022
Instrument	2022-038942

Lender

Name	WELLS FARGO BANK NA
Type	Bank
Address	SIOUX FALLS, SD 57104

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jun 1, 2052

August 2018: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SAN MATEO CA
Recording Date	Aug 14, 2018
Property Address	450 MIDDLEFIELD RD, ATHERTON, CA 94027-3216
Document Number	0000063392
Map Reference	VOL3 PG1
Instrument Date	Aug 8, 2018
Instrument	2018-063392
Transaction Type	Transfer
Record Updated	Aug 5, 2022
Title Company	FIRST AMERICAN TITLE CO

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name
Address	00000

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust
Address	450 MIDDLEFIELD RD, ATHERTON, CA 94027-3216

Mortgage

Document Number	0000063394
Date	Aug 14, 2018
Instrument	2018-063394

Lender

Name	FIRST REPUBLIC BANK
Type	Bank

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	300 Months
Due	Aug 26, 2043

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

Mortgage

Document Number	0000063393
Date	Aug 14, 2018
Instrument	2018-063393

Lender

Name	FIRST REPUBLIC BANK
Type	Bank
Address	SAN FRANCISCO, CA 94111

Agreement

Type	ARM
Amount	Amount Recorded
Term	361 Months
Due	Sep 1, 2048

Interest

Rate Type	Adjustable Rate
Rate	3.7%
Type Change Date	Sep 1, 2028
Change Frequency	Annually
Min Rate At Change	2.65%
Index	LIBOR
Max Rate	10.9%

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	Menlo Park City 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		$5,727,376 (+2%) Land $3,094,101 Building $2,633,275
2025	$64,229.00 (+4.83%) Homeowner's exemption	$5,615,076 (+4.04%) Land $3,033,433 Building $2,581,643
2023	$61,272.00 (+2.33%) Homeowner's exemption	$5,397,038 Land $2,915,642 Building $2,481,396	$7,863,390
2022	$59,877.00

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

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
Nearby Flood Policies	4 in force

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	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 167 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Race Communications Fiber	10,000 / 10,000
Xfinity Cable	2,000 / 250
AT&T Fiber · DSL	1,000 / 1,000
Verizon Fixed Wireless	300 / 20

May also be available: Sonic Telecom, T-Mobile.

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