As the MLS and public records start to fill up, we'll list the details here.
Year
Property tax
Land + Additions
Assessment*
2025
$4,523 (+5.2%)
$67,500 + $165,000
$232,500
2024
$4,301 (+10.9%)
$67,500 + $165,000
$232,500
2023
$3,877
$67,500 + $165,000
$232,500
2022
$3,873 (+2.4%)
$62,500 + $123,700
$186,200
2021
$3,781 (−3.2%)
$62,500 + $123,700
$186,200
2020
$3,908 (+6.5%)
$62,500 + $123,700
$186,200
2019
$3,671 (+7.4%)
$54,400 + $102,000
$156,400
2018
$3,417 (+3.4%)
$54,400 + $102,000
$156,400
2017
$3,304 (+3.3%)
$54,400 + $102,000
$156,400
2016
$3,197 (+13.0%)
$47,700 + $89,800
$137,500
2014
$2,829 (−4.7%)
$47,700 + $77,000
$124,700
2013
$2,969
$47,700 + $77,000
$124,700
Tax history for 145 Union St
Year
Property tax
Land + Additions
Assessment*
2025
$4,523 (+5.2%)
$67,500 + $165,000
$232,500
2024
$4,301 (+10.9%)
$67,500 + $165,000
$232,500
2023
$3,877
$67,500 + $165,000
$232,500
2022
$3,873 (+2.4%)
$62,500 + $123,700
$186,200
2021
$3,781 (−3.2%)
$62,500 + $123,700
$186,200
2020
$3,908 (+6.5%)
$62,500 + $123,700
$186,200
2019
$3,671 (+7.4%)
$54,400 + $102,000
$156,400
2018
$3,417 (+3.4%)
$54,400 + $102,000
$156,400
2017
$3,304 (+3.3%)
$54,400 + $102,000
$156,400
2016
$3,197 (+13.0%)
$47,700 + $89,800
$137,500
2014
$2,829 (−4.7%)
$47,700 + $77,000
$124,700
2013
$2,969
$47,700 + $77,000
$124,700
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
SR-4
Suburban Residential District
This district is intended to permit development which has a moderate density, suburban community character. This district is intended to be the principal district for single-family development within the city. Unlike the case for the previously described residential districts, the land use standards for this district permit both single-family detached residential development and certain types of moderate density single-family attached development, as well as a variety of related institutional land uses.
Permitted uses
Include but are not limited to:
Housing-Other
Public service-Other
Property details
Exterior
Property Information
Subdivision Name: ORIGINAL PLAT/SUN PRAIRIE
Legal Description: ORIGINAL PLAT BLOCK 11 PRT LOT 7 N 66 FT THF
Lot Information
Land Sq. Ft: 12,023
Legal Lot Number: 7
Legal Block Number: 11
Municipality Name: CITY OF SUN PRAIRIE
Acres: 0.276
County Use Description: RESIDENTIAL
Financial
Assessor Information
Assessment Year: 2025
Public facts
Beds: —
Baths: —
Sq. Ft.: —
Stories: —
Lot Size: 0.28 acres
Style: Single Family Residential
Year Built: —
Year Renovated: —
County: Dane County
APN: 081105313272
Home facts updated by county records on Aug 6, 2026
Around this home
Schools
Northside Elementary School
Public PreK-5 • Assigned • 0.7mi
3/10
Prairie View Middle School
Public 6-8 • Assigned • 1.9mi
3/10
Sun Prairie East High School
Public 9-12 • Assigned • 0.9mi
9/10
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
2/10 Heat Factor
7 days above 100° expected this year, 14 days in 30 years
2/10 Wind Factor
Minor risk of severe winds over next 30 years
2/10 Air Factor
2 unhealthy days expected this year, 2 days in 30 years
Provided by First Street
Historical weather
Sun Prairie, WI • 53590
Average low and high temperatures (°F)
25
11
34
18
50
30
59
40
69
48
79
61
84
66
77
61
74
55
64
46
46
33
31
17
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 9.7 hours in
June and 3.5 hours in December, placing it below the
U.S. average for solar exposure.
9.7 hrs
3.5 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$283,000 – $342,000
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