307 Costello Dr, Los Altos, CA 94024 Property Records

Santa Clara County property record for 307 Costello Dr, Los Altos, CA 94024

Property Summary

Property Type	Single Family Home
Details	4 bd · 4.5 ba · 3,843 sqft · built 2006
Lot Size	0.474 acres (20,664 sqft)
Owner	2 Trust Names on File
Last Sale	$3,032,000 (Dec 2009)
Tax Bill	$47,120 (2025)
Deeds & Mortgages	Dec 2023 Transfer Nov 2022 Transfer + 2 more
Flood Zone	Zone D (undetermined)
APN	`336-12-023`

Property Details

APN / Parcel Number

Primary APN	`336-12-023`

Interior

Bedrooms	4 Beds
Full Baths	4.5 Baths
Half Baths	1 Half Bath
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	3,843 sqft Living Area
1st Floor Area	2,572 sqft
2nd Floor Area	1,271 sqft
Family Room	Family Room
Utility Room	Utility Room
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 2006
Effective Year Built	Effective 2006
Architectural Style	H-Shape
Construction Type	Wood
Lot Area	20,664 sqft (0.474 acres)
Lot Dimensions	164 ft deep x 126 ft wide
Garage Area	488 sqft
Parking Spaces	2 Parking Spaces
Pool Type	Pool with Hot Tub/Spa
Pool Area	9,991 sqft
Porch	Porch

Utilities, Heating & Cooling

Cooling System	HVAC
Heating System	Forced Air with A/C

Location & Zoning

Street Address	307 COSTELLO DR
City	LOS ALTOS
State	CA
Zip	94024-4708
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1E-2
Legal Description	TRACT 526 KALISTA HEIGHTS BOOK 18 PAGE 45 LOT 5
Legal Subdivision	KALISTA HEIGHTS
Legal Tract	526
Legal Lot Number	5
Jurisdiction	SANTA CLARA CA
Township / Civil Division	SAN JOSE
Census Block Group	1
Census Block	1001
Census Tract	511702

Owner

307 Costello Dr is owner-occupied and held in a trust since December 2023.

Source: Santa Clara County records, as of July 27, 2026

Owner of Record	2 Trust Names on File
Mailing Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Family Trust

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

Deeds, Mortgages & Sale History

Date	Document
Dec 7, 2023	Intrafamily Transfer, Transfer
Nov 17, 2022	Intrafamily Transfer, Transfer
Feb 24, 2021	Deed of Trust, Mortgage · Conventional Mortgage LOANDEPOT.COM LLC
Nov 4, 2020	Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LOANS LLC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Dec 21, 2009 · Amount on File
Deed Sale	Dec 21, 2009 · Amount on File
Prior Sale	Mar 7, 2006 · Amount on File
Deed Document Number	200920546964
Last Transfer Date	Dec 1, 2023
Transfer Doc	0025572666
Record Updated	Sep 20, 2026

December 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SANTA CLARA CA
Recording Date	Dec 7, 2023
Property Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708
Document Number	0025572666
Map Reference	MB 18 PG 45
Instrument Date	Dec 1, 2023
Instrument	25572666
Transaction Type	Transfer
Record Updated	Dec 18, 2023

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust
Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708

November 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SANTA CLARA CA
Recording Date	Nov 17, 2022
Property Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708
Document Number	0025401489
Map Reference	MB 18 PG 45
Instrument Date	Nov 15, 2022
Instrument	25401489
Transaction Type	Transfer
Record Updated	Jun 7, 2023

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708

February 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708
Transaction Type	Mortgage
Record Updated	Mar 4, 2021
Title Company	LAWYERS TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708

Mortgage

Document Number	0024846309
Date	Feb 24, 2021
Instrument	24846309

Lender

Name	LOANDEPOT.COM LLC
Type	Mortgage Company
Address	FOOTHILL RANCH, CA 92610

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	181 Months
Due	Mar 1, 2036

November 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	WESTERN RESOURCES TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	307 COSTELLO DR, LOS ALTOS, CA 94024-4708

Mortgage

Document Number	0024686896
Date	Nov 4, 2020
Instrument	24686896

Lender

Name	QUICKEN LOANS LLC
Type	Mortgage Company
Address	DETROIT, MI 48226

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	180 Months
Due	Nov 1, 2035

Tax Assessment & Valuation

The 2025 property tax bill for 307 Costello Dr was $47,120.

Source: Santa Clara County assessment roll, as of July 27, 2026

Property Jurisdictions

Type	Name
State	California
County	Santa Clara County
Elementary School District	Los Altos Elementary School District (KG - 08)
Secondary School District	Mountain View-Los Altos Union School District (09 - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$3,992,043 (+2%) Land $2,304,115 Building $1,687,928
2025	$47,120.00	$3,913,769 Land $2,258,937 Building $1,654,832
2023	$44,507.00 (+0.44%) Homeowner's exemption	$3,761,795 Land $2,171,221 Building $1,590,574
2022	$44,313.00

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

Flood

FEMA maps place 307 Costello Dr in Zone D, where flood risk has not been studied.

Source: FEMA National Flood Hazard Layer, effective January 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone D undetermined · not studied
Flood Insurance Requirement	Not required lenders may require it
Community Rating System	Class 10 (0% premium discount)
Nearby Flood Policies	7 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

Wildfire risk around 307 Costello Dr is low, with less than a 0.01% annual chance of 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	CWSC LOS ALTOS SUBURBAN private · serves 63,559 people · EPA ID CA4310001
Water Source	Purchased surface water from several systems
Last State Inspection	Aug 2024
Lead	2 ppb (2023–2025) 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 286 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · Fixed Wireless in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Etheric Networks Fixed Wireless	250 / 100

May also be available: Cruzio, GeoLinks, Ridge Wireless, T-Mobile.

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