Grand 7-Bedroom, 4 bathroom Estate on Expansive 1-Acre Corner Lot Presenting an exceptional opportunity to own a spacious residence. This impressive home offers a substantial layout ideal for multigenerational living, remote work, or entertaining on a grand scale. Recent upgrades include modern electric panels, electric car charger, water heater, AC/heater, ensuring the home is well-equipped for today’s demands and future enhancements. The septic system has been recently cleaned and the expansive grounds offer endless possibilities—from adding a pool or guest house to creating a serene outdoor retreat. Located in a desirable area walkable to excellent charter schools, Jerusalem Charter (K–8) & Delta Charter (K–12). This property combines comfort, flexibility, and long-term value in one remarkable package.
Single-familyProperty Type
1949Year Built
1 acresLot Size
$393Est. Price/Sq.Ft.
2 car garageParking
Listed by Hector Hernandez•DRE #01472758• Intero Real Estate Services
Listed by Maricruz Salas•DRE #02160698• Intero Real Estate Services
Bought with Ling Zhang•DRE #01937432• CalCity Investments, Inc
bridgeMLS, Bay East AOR, or Contra Costa AOR #41092826
Jul 18, 2025
Sold
$650,000
$241/sq ft
Jun 13, 2025
Pending
—
Apr 10, 2025
Listed
$888,888
$330/sq ft
Public Records
Jul 31, 2015
Sold
$365,000
$136/sq ft
Public Records
Dec 7, 2001
Sold
$300,000
$111/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$4,860 (+3.2%)
$195,000 + $455,000
$650,000
2024
$4,711 (−2.3%)
$127,661 + $329,752
$457,413
2023
$4,821 (+5.9%)
$125,158 + $323,287
$448,445
2022
$4,551 (+1.5%)
$122,704 + $316,949
$439,653
2021
$4,483 (+1.1%)
$120,299 + $310,735
$431,034
2020
$4,436 (+1.0%)
$117,941 + $304,643
$422,584
2019
$4,390 (−39.9%)
$116,732 + $301,520
$418,252
2018
$7,307 (+83.8%)
$114,444 + $297,302
$411,746
2017
$3,975 (+1.8%)
$112,200 + $260,100
$372,300
2016
$3,903 (+77.9%)
$112,200 + $260,100
$372,300
2015
$2,194 (+8.3%)
$110,000 + $255,000
$365,000
2014
$2,025 (−0.8%)
$131,310 + $54,625
$185,935
2013
$2,041 (+1.8%)
$131,310 + $54,625
$185,935
2012
$2,006 (+2.0%)
$130,718 + $54,378
$185,096
2011
$1,967 (+1.0%)
$128,155 + $53,312
$181,467
2010
$1,948 (−3.9%)
$125,643 + $52,267
$177,910
2009
$2,028 (−45.0%)
$124,704 + $51,877
$176,581
2008
$3,685
$142,000 + $35,000
$177,000
Tax history for 31145 S Koster Rd
Year
Property tax
Land + Additions
Assessment*
2025
$4,860 (+3.2%)
$195,000 + $455,000
$650,000
2024
$4,711 (−2.3%)
$127,661 + $329,752
$457,413
2023
$4,821 (+5.9%)
$125,158 + $323,287
$448,445
2022
$4,551 (+1.5%)
$122,704 + $316,949
$439,653
2021
$4,483 (+1.1%)
$120,299 + $310,735
$431,034
2020
$4,436 (+1.0%)
$117,941 + $304,643
$422,584
2019
$4,390 (−39.9%)
$116,732 + $301,520
$418,252
2018
$7,307 (+83.8%)
$114,444 + $297,302
$411,746
2017
$3,975 (+1.8%)
$112,200 + $260,100
$372,300
2016
$3,903 (+77.9%)
$112,200 + $260,100
$372,300
2015
$2,194 (+8.3%)
$110,000 + $255,000
$365,000
2014
$2,025 (−0.8%)
$131,310 + $54,625
$185,935
2013
$2,041 (+1.8%)
$131,310 + $54,625
$185,935
2012
$2,006 (+2.0%)
$130,718 + $54,378
$185,096
2011
$1,967 (+1.0%)
$128,155 + $53,312
$181,467
2010
$1,948 (−3.9%)
$125,643 + $52,267
$177,910
2009
$2,028 (−45.0%)
$124,704 + $51,877
$176,581
2008
$3,685
$142,000 + $35,000
$177,000
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Public record
Public record
Zoning
Permits
Beds
4
Baths
2
Stories
1
Lot width
—
Lot depth
—
Lot size
1 Acre
Year renovated
1949
Sq. Ft.
2,346
Year built
1949
Style
Single Family Residential
County
San Joaquin County
APN
25531015
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Aug 6, 2026.
R-R
Rural Residential Zone
The Rural Residential Zone provides for large-lot rural homesites within existing rural communities where full urban services are not available or expected and in urban communities where rural residential densities already exist. Lots will generally have sufficient area to allow for individual water supply, sewage disposal, and storm water drainage. Typically, areas in this zone will contain parcels too small to support significant commercial agriculture, yet are suitable for residential use without undue detriment to the agricultural productivity of San Joaquin County. This zone implements the Rural Residential land use designation of the General Plan.
Permitted uses
Include but are not limited to:
Garden center
Housing-Single unit
Housing-Senior
Infrastructure
Agriculture-Cropland
Feb 20, 2019 • Final
Fire county
Convert an existing garage into a bedroom and a carport into a garage. Construct an addition to include a new bedroom, office, and bathroom.
Addition
Remodel
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Parking
Parking Information
Garage Spaces: 2
Covered Spaces: 2
Parking Features: Attached
Interior
Bathroom Information
# of Bathrooms Total: 4
# of Bathrooms Full: 4
Interior Features
Interior Features: No Additional Rooms
Appliances: Dishwasher, Electric Range, Electric Water Heater, Water Softener
Laundry Features: 220 Volt Outlet, Hookups Only, Laundry Room, Electric
Street Level Features: 6+ Bedrooms, 4 Baths, Laundry Facility, Main Entry
Fireplaces Total: 1
Has Fireplace
Flooring: Laminate
Room Information
Kitchen Features: Stone Counters,Dishwasher,Electric Range/Cooktop,Disposal
Rooms Total: 11
Fireplace Features: Electric
Exterior
Building Information
Construction Materials: Stucco
Building Area Total: 2,692
Exterior Features
Exterior Features: Back Yard, Front Yard
Fencing: Fenced
Property Information
Living Area: 2692
Living Area Units: Square Feet
Property Type: Residential
Property Sub Type: Single Family Residence
Year Built: 1949
Lot Information
Lot Size Square Feet: 43560
Lot Size Area: 1
Lot Size Units: Acres
Lot Size Acres: 1
Lot Features: Corner Lot, Level
Utilities
Utility Information
Electric: Photovoltaics Third-Party Owned
Sewer: Septic Tank
Utilities: All Electric
Heating & Cooling
Has Heating
Heating: Forced Air
Cooling: Central Air
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 2,346
Stories: 1.0
Lot Size: 1 acres
Style: Single Family Residential
Year Built: 1949
Year Renovated: 1949
County: San Joaquin County
APN: 25531015
Home facts updated by county records on Aug 6, 2026
Around this home
Schools
New Jerusalem School
Charter 1-8 • Assigned • 0.2mi
5/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
4/10 Fire Factor
1% chance of being in a wildfire in next 30 years
7/10 Heat Factor
7 days above 102° expected this year, 16 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
10/10 Air Factor
24 unhealthy days expected this year, 26 days in 30 years
Provided by First Street
Historical weather
Tracy, CA • 95304
Average low and high temperatures (°F)
59
40
64
45
72
50
74
51
82
56
90
59
90
59
94
62
89
61
79
56
64
48
55
44
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 12.8 hours in
June and 4.6 hours in December, placing it above the
U.S. average for solar exposure.
12.8 hrs
4.6 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.01M – $1.22M
Sell confidently with a local market expert in Tracy. 3 minutes to get started.
Property information provided by bridgeMLS, Bay East AOR, or Contra Costa AOR when last listed in 2025. This data may not match public records. Learn more.