1. Home
  2. California
  3. Contra Costa County
  4. Alamo
  5. Flagstone Ct

20 Flagstone Ct, Alamo, CA 94507 Property Records

Contra Costa County property record for 20 Flagstone Ct, Alamo, CA 94507

Property Summary

Property TypeSingle Family Home
Details4 bd · 3 ba · 2,128 sqft · built 1960
Lot Size0.529 acres (23,040 sqft)
OwnerIndividual Name on Record
Last Sale$2,400,000 (Aug 2024)
Tax Bill$26,973 (2025)
Deeds & MortgagesAug 2022 Sale & Mortgage
Flood ZoneZone X (minimal risk)
APN193-272-004-6

Property Details

APN / Parcel Number

Primary APN193-272-004-6
Alternative APN
  • 193-272-004

Interior

Bedrooms4 Beds
Full Baths3 Baths
Total Rooms9 Rooms
Stories1 Story
Building Area2,128 sqft Living Area
Gross Area2,527 sqft
1st Floor Area2,128 sqft

Exterior

Year BuiltBuilt 1960
Effective Year BuiltEffective 2020
Lot Area23,040 sqft (0.529 acres)
Garage TypeAttached
Garage Area399 sqft
Parking Spaces1 Parking Space

Location & Zoning

Street Address20 FLAGSTONE CT
CityALAMO
StateCA
Zip94507-1601
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning CodeR20
Legal DescriptionTRACT 2805 LOT 58
Legal SubdivisionSUBDIVISION 2805
Legal Tract2805
Legal Lot Number58
JurisdictionCONTRA COSTA CA
Township / Civil DivisionCENTRAL CONTRA COSTA
Census Block Group1
Census Block1003
Census Tract346102

Owner

Source: Contra Costa County records, as of July 14, 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of RecordIndividual Name on Record
Mailing Address20 FLAGSTONE CT, ALAMO, CA 94507-1601
OccupancyOwner Occupied
Owner TypeIndividual
VestingSingle Man

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed NamesName on Deed
Last SaleAug 29, 2024 · Amount on Record
Deed SaleAug 29, 2024 · Amount on Record
Prior SaleAug 24, 2022 · Amount on Record
Deed Document Number202484517
Prior Transfer DateNov 24, 1998
Prior Transfer Doc0000300765
Record UpdatedOct 29, 2026

August 2022: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionCONTRA COSTA CA
Recording DateAug 24, 2022
Property Address20 FLAGSTONE CT, ALAMO, CA 94507-1601
Document Number0000130412
Map ReferenceMB 77 PG 35
Instrument DateAug 18, 2022
Instrument2022-130412
Transaction TypeTransfer
Record UpdatedNov 3, 2022
Title CompanyNOT AVAILABLE, DOMA TITLE OF CALIFORNIA INC

Transaction

AmountAmount Recorded
DownpaymentDownpayment on Record
Loan-to-Value (LTV)LTV on Record
Tax$0.00
Amount AccuracyRounded by County
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address20 FLAGSTONE CT, ALAMO, CA 94507-1601

Mortgage

Document Number0000130413
DateAug 24, 2022
Instrument2022-130413
Lender
NameCITIBANK NA
TypeBank
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term361 Months
DueSep 1, 2052
Interest
Rate TypeAdjustable Rate
Rate3.62%
Type Change DateSep 1, 2032
Min Rate At Change2.75%
Max Rate At Change8.62%
IndexOther
Max Rate8.62%

Tax Assessment & Valuation

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
Unified School DistrictSan Ramon Valley Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$2,448,000 (+2%) Land $1,632,000 Building $816,000
2025$26,973.00 (+55.78%) Homeowner's exemption$2,400,000 (+6%) Land $1,600,000 Building $800,000
2023$17,315.00 (+486.55%)$1,500,000 Land $1,200,000 Building $300,000
2022$2,952.00

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

Flood

Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Flood Insurance CostPremium on Record
median of 19 policies
Community Rating SystemClass 6 (20% premium discount)
Nearby Flood Policies19 in force
Nearby Flood Claims8 (1987–2012)
Claims Outside the SFHA1 of 8
Most Recent ClaimOct 2012 · tidal / storm surge

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 RiskLow
lower than 80% of the US · lower than 88% of California
Wildfire Likelihood0.01% annual chance
ExposureNone
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 SystemEAST BAY MUD
serves 1,468,000 people · EPA ID CA0110005
Water SourceSurface water
Last State InspectionDec 2021
LeadUnder 1 ppb (2022–2024)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
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. This system sells water to local utilities; the supplier billing this address may be one of them.

Internet Providers

Source: FCC Broadband Data Collection, based on 284 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Xfinity
Cable		2,000 / 250
Unwired
Fixed Wireless		300 / 25
Verizon
Fixed Wireless		300 / 20
AT&T
DSL		100 / 20

Cell Coverage

5G (outdoors only) and 4G LTE

Nearby Properties on Flagstone Ct

Nearby Streets

Search Property Records by Address or Parcel Number

Search by:

By searching, you agree to: Terms • Privacy • Disclosures