12233 Alcosta Blvd is a 100 square foot house on a 100 square foot lot with 1 bedroom. - it last sold on December 03, 2012 for $793,000. Based on Redfin's San Ramon data, we estimate the home's value is $1,221,415.
Single-familyProperty Type
2002Year Built
100 sq ftLot Size
$12,214Est. Price/Sq.Ft.
2 car garageParking
Source:Public Records
Redfin Estimate
$1,221,415
$428K since sold in December 2012$7,000 since October
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 38.3% lower than the average sale price ($1.98M) of 5 comparable homes.
bridgeMLS, Bay East AOR, or Contra Costa AOR #40117333
Nov 13, 2005
Listing Removed
—
bridgeMLS, Bay East AOR, or Contra Costa AOR #40115693
Oct 12, 2005
Listing Removed
—
bridgeMLS, Bay East AOR, or Contra Costa AOR #40107998
Oct 5, 2005
Listing Removed
—
Year
Property tax
Land + Additions
Assessment*
2026
$12,019 (+3.2%)
$477,294 + $518,746
$996,040
2025
$11,645 (+2.1%)
$477,294 + $518,746
$996,040
2024
$11,404 (+1.6%)
$467,936 + $508,575
$976,511
2023
$11,220 (+3.7%)
$458,761 + $498,603
$957,364
2021
$10,819 (+1.1%)
$440,948 + $479,243
$920,191
2020
$10,706 (+1.1%)
$432,302 + $469,847
$902,149
2019
$10,587 (+3.9%)
$427,870 + $465,030
$892,900
2018
$10,192 (+3.8%)
$419,481 + $455,912
$875,393
2017
$9,819 (+1.3%)
$403,193 + $438,209
$841,402
2016
$9,693 (+1.3%)
$403,193 + $438,209
$841,402
2015
$9,567 (+1.4%)
$395,288 + $429,617
$824,905
2014
$9,435 (+1.2%)
$381,725 + $414,875
$796,600
2013
$9,320
$381,725 + $414,875
$796,600
2012
$9,329
$380,000 + $413,000
$793,000
2011
$9,323 (−11.5%)
$311,050 + $492,950
$804,000
2010
$10,531 (+0.1%)
$311,050 + $492,950
$804,000
2009
$10,520 (+1.4%)
$355,928 + $564,072
$920,000
2008
$10,370
$355,928 + $564,072
$920,000
Tax history for 12233 Alcosta Blvd
Year
Property tax
Land + Additions
Assessment*
2026
$12,019 (+3.2%)
$477,294 + $518,746
$996,040
2025
$11,645 (+2.1%)
$477,294 + $518,746
$996,040
2024
$11,404 (+1.6%)
$467,936 + $508,575
$976,511
2023
$11,220 (+3.7%)
$458,761 + $498,603
$957,364
2021
$10,819 (+1.1%)
$440,948 + $479,243
$920,191
2020
$10,706 (+1.1%)
$432,302 + $469,847
$902,149
2019
$10,587 (+3.9%)
$427,870 + $465,030
$892,900
2018
$10,192 (+3.8%)
$419,481 + $455,912
$875,393
2017
$9,819 (+1.3%)
$403,193 + $438,209
$841,402
2016
$9,693 (+1.3%)
$403,193 + $438,209
$841,402
2015
$9,567 (+1.4%)
$395,288 + $429,617
$824,905
2014
$9,435 (+1.2%)
$381,725 + $414,875
$796,600
2013
$9,320
$381,725 + $414,875
$796,600
2012
$9,329
$380,000 + $413,000
$793,000
2011
$9,323 (−11.5%)
$311,050 + $492,950
$804,000
2010
$10,531 (+0.1%)
$311,050 + $492,950
$804,000
2009
$10,520 (+1.4%)
$355,928 + $564,072
$920,000
2008
$10,370
$355,928 + $564,072
$920,000
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
RS-6
Single-Family Residential Zone
The RS zone is applied to areas of the City appropriate for single-family residential land uses in neighborhoods at a density of three to six units per net acre, subject to appropriate standards. The specific allowable density for each parcel is shown on the Zoning Map by a numerical suffix residential density designator (see Section D2-8). Minimum lot size for new parcels ranges from 3,500 to 12,000 sq ft. Depending upon the applicable residential density designator, the RS zone is consistent with and implements the Single Family Low Density, Single Family Low-Medium Density, and Single Family Medium Density land use classifications of the General Plan.
Permitted uses
Include but are not limited to:
Day care facility
Housing-Single unit
Housing-Senior
Housing-Student
Housing-Other
Property details
Interior
Room Information
# of Rooms: 11
Exterior
Property Information
Subdivision Name: TERRAZZO SUB 8415
Living Sq. Ft: 3,261
Ground Floor Sq. Ft: 1,637
Building Sq. Ft: 3,261
# of Stories: 2
Legal Description: T8415 L1
Parking & Garage Information
Garage/Parking Sq. Ft: 712
Lot Information
# of Buildings: 1
Land Sq. Ft: 7,405
Legal Lot Number: 1
Acres: 0.17
County Use Description: SINGLE FAMILY DETACHED WITH MA
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 1
Baths: 3.0
Sq. Ft.: 100
Stories: 2.0
Parking Spaces: 2
Basement: No
Accessible: No
Lot Size: 100 square feet
Style: Single Family Residential
Year Built: 2002
Year Renovated: 2002
County: Contra Costa County
APN: 2124300530
HOA Dues: —
Garage: No
Features: —
Home facts updated by owner on Mar 9, 2026
Around this home
Schools
K - 12
Preschool & daycare
Montevideo Elementary School
Public K-5 • Assigned • 0.6mi
9/10
Iron Horse Middle School
Public 6-8 • Assigned • 1.5mi
10/10
California High School
Public 9-12 • Assigned • 0.6mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Local insights from Redfin agents
San Ramon, Past 3 months,Median price $1.51M, down 4.5% YoY,Homes sold: 169 in July, up 1%,Days on market 20 days,Market Active but more balanced; slight seller advantage,Bottom line: Prices have softened, but homes are still selling relatively...