77 Serrano Dr, #77A, Atherton, CA 94027 Property Records

San Mateo County property record for 77 Serrano Dr, #77A, Atherton, CA 94027

Property Summary

Property Type	Single Family Home
Details	4 bd · 4.5 ba · 4,790 sqft · built 1999
Lot Size	0.812 acres (35,375 sqft)
Owner	Company Name on Record
Last Sale	$10,380,000 (Feb 2020)
Tax Bill	$125,731 (2025)
Deeds & Mortgages	Jul 2020 Mortgage Feb 2020 Sale + 1 more
Flood Zone	Zone X (minimal risk)
APN	`059-284-010`

Property Details

APN / Parcel Number

Primary APN	`059-284-010`

Interior

Bedrooms	4 Beds
Full Baths	4.5 Baths
Half Baths	1 Half Bath
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	4,790 sqft Living Area
1st Floor Area	2,700 sqft
2nd Floor Area	2,090 sqft
Family Room	Family Room
Study	Study
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1999
Effective Year Built	Effective 1999
Architectural Style	Contemporary
Exterior Material	Wood Siding
Construction Type	Frame
Roof Material	Tar & Gravel
Lot Area	35,375 sqft (0.812 acres)
Lot Dimensions	185 ft deep x 223 ft wide
View / Lot	Corner
Garage Area	730 sqft
Parking Spaces	3 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Radiant
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	77 SERRANO DR, 77A
City	ATHERTON
State	CA
Zip	94027-3958
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1001A
Legal Description	LOT 5 BLOCK 4 ATHERTON OAKS RSM 16/10 11 TOWN OF ATHERTON
Legal Subdivision	ATHERTON OAKS
Legal Block	4
Legal Lot Number	5
Jurisdiction	SAN MATEO CA
Township / Civil Division	SAN MATEO
Census Block Group	4
Census Block	4018
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	77 SERRANO DR, ATHERTON, CA 94027-3958
Owner Type	Company

Deeds, Mortgages & Sale History

Date	Document
Jul 16, 2020	Deed of Trust, Mortgage NORTHERN TR
Feb 6, 2020	Grant Deed, Transfer OLD REPUBLIC TITLE
Apr 5, 2019	Grant Deed, Transfer LAWYERS TITLE

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Feb 6, 2020 · Amount on Record
Deed Sale	Feb 6, 2020 · Amount on Record
Prior Sale	Apr 5, 2019 · Amount on Record
Deed Document Number	202010284
Prior Transfer Date	Jan 12, 2015
Prior Transfer Doc	0000047962
Record Updated	Sep 20, 2026

July 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SAN MATEO CA
Property Address	77 SERRANO DR, ATHERTON, CA 94027-3958
Document Number	0000069840
Instrument Date	Jul 16, 2020
Transaction Type	Mortgage
Record Updated	Aug 11, 2020
Title Company	OLD REPUBLIC TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	77 SERRANO DR ATHERTON CA 940273958, ATHERTON, CA 94027-3958

Mortgage

Document Number	0000069840
Date	Jul 21, 2020
Instrument	69840

Lender

Name	NORTHERN TR
Address	CHICAGO, IL 60603

Agreement

Amount	Amount Recorded
Term	360 Months
Due	Jul 20, 2050

Interest

Rate Type	Adjustable Rate
Rate	2.62%

February 2020: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Feb 6, 2020
Property Address	77 SERRANO DR, ATHERTON, CA 94027-3958
Document Number	0000010284
Instrument Date	Feb 3, 2020
Instrument	10284
Transaction Type	Transfer
Record Updated	Mar 3, 2020
Title Company	OLD REPUBLIC TITLE

Transaction

Amount	Amount Recorded
Tax	$11,418.00
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	77 SERRANO DR ATHERTON CA 940273958, ATHERTON, CA 94027-3958

April 2019: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SAN MATEO CA
Recording Date	Apr 5, 2019
Property Address	77 SERRANO DR, ATHERTON, CA 94027-3958
Document Number	0000024385
Instrument Date	Apr 2, 2019
Instrument	24385
Transaction Type	Transfer
Record Updated	Jan 10, 2020
Title Company	LAWYERS TITLE

Transaction

Amount	Amount Recorded
Tax	$13,420.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property
Address	77 SERRANO DR ATHERTON CA 940273958, ATHERTON, CA 94027-3958

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	Redwood 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
2026		$11,604,582 (+2%) Land $8,924,150 Building $2,680,432
2025	$125,731.00 (+1.37%)	$11,377,042 (+4.27%) Land $8,749,167 Building $2,627,875
2024	$124,028.00 (+1.57%)
2023	$122,115.00 (+4.96%)	$10,911,230 Land $8,409,427 Building $2,501,803
2022	$116,344.00

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
Nearby Flood Policies	7 in force
Nearby Flood Claims	8 (1979–2019)
Claims Outside the SFHA	2 of 8
Most Recent Claim	Jan 2019 · other causes

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 94% of the US · lower than 96% of California
Wildfire Likelihood	0.02% 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 168 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.

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