321 Semillon Ln is a 1,912 square foot condo with 3 bedrooms and 2.5 bathrooms. Based on Redfin's Santa Rosa data, we estimate the home's value is $791,478.
CondoProperty Type
2022Year Built
$414Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$791,478
$21K since July
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 16.8% higher than the average sale price ($678K) of 5 comparable homes.
As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$8,667 (+1.5%)
$233,465 + $540,609
$774,074
2024
$8,535 (+1,134.8%)
$228,888 + $530,009
$758,897
2023
$691 (+6.5%)
$224,400 + $519,617
$744,017
2022
$649
$57,229
Tax history for 321 Semillon Ln
Year
Property tax
Land + Additions
Assessment*
2025
$8,667 (+1.5%)
$233,465 + $540,609
$774,074
2024
$8,535 (+1,134.8%)
$228,888 + $530,009
$758,897
2023
$691 (+6.5%)
$224,400 + $519,617
$744,017
2022
$649
$57,229
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
R-1-6
Single-Family Residential District - 6,000 sq ft
The R-1 zoning district is applied to areas of the City intended to be maintained as residential neighborhoods comprised of detached and attached single-family houses, clustered Residential hillside projects, and small multi-family projects, together with compatible accessory uses. The maximum allowable density ranges from two to 13 dwellings per acre, with the specific allowable density for each parcel shown on the zoning map by a numerical suffix to the R-1 map symbol see Section 20-22.040. The R-1 zoning district implements and is consistent with the Residential Very Low Density where residential clustered on hillsides is desirable, Low Density or Open Space, Low Density, and Medium Low Density land use classifications of the General Plan.
Permitted uses
Include but are not limited to:
Agriculture-Other
Day care facility
Healthcare-Other
Housing-Single unit
Housing-Student
Housing-Other
Infrastructure-Other
Housing-Mobile home park
Feb 7, 2023 • Final
Residential new
Construct a three-story, four-unit attached condominium townhome building. The project includes attached garages, patios, and a deck. One unit is designated as affordable housing and another as an adaptable dwelling unit.
New construction
Aug 31, 2022 • Active
Residential addition-alteration
Electrical
Solar
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
Interior
Bathroom Information
# of Full Baths: 2
# of 1/2 Baths: 1
Room Information
# of Rooms: 6
Exterior
Exterior Information
Building Style Type: Square Design
Building Construction Quality: Good
Property Information
Subdivision Name: ROUND BARN VILLAGE CONDOS
Living Sq. Ft: 1,912
Building Sq. Ft: 2,393
# of Stories: 3
Legal Description: 2022 ROUND BARN VILLAGE CONDO BLDG 26 UNIT 147
Parking & Garage Information
Parking Type: Attached Garage
Garage/Parking Sq. Ft: 481
Garage / Carport Type: Attached
Lot Information
# of Buildings: 1
Land Sq. Ft: 1,912
Legal Lot Number: 1
Acres: 0.0439
County Use Description: CONDOMINIUM UNIT
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 2.5
Sq. Ft.: 1,912
Stories: 3.0
Lot Size: —
Style: Condo/Co-op
Year Built: 2022
Year Renovated: 2023
County: Sonoma County
APN: 173850012000
Home facts updated by county records on Aug 13, 2026
Around this home
Schools
Hidden Valley Elementary Satellite School
Public K-6 • Assigned • 1.5mi
8/10
Santa Rosa Middle School
Public 7-8 • Assigned • 2.6mi
2/10
Santa Rosa High School
Public 9-12 • Assigned • 1.9mi
6/10
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
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
4/10 Heat Factor
7 days above 92° expected this year, 14 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
10/10 Air Factor
21 unhealthy days expected this year, 21 days in 30 years
Provided by First Street
Historical weather
Santa Rosa, CA • 95403
Average low and high temperatures (°F)
62
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71
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77
50
80
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78
53
86
54
82
54
78
50
64
44
59
42
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
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Oct
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Dec
Sun exposure
In this area, properties receive around 11.1 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
11.1 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$752,000 – $911,000
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