Skip to content
Skip to content
TopHapOpen in map
Single Family ResidenceResidential
$670,986$287 / ft²
TopHap EstimateOur estimate of what this home would sell for today, based on nearby sales, the home's size and features, and local price trends. It is a starting point, not an appraisal.· confidence 96How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Sep 24, 2026
Last sold for $440,000 on Nov 8, 2017

12870 ROSEMARY ST

THORNTON, CO 80602
4
Beds
4
Baths
2,335 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.14 ac
Lot SizeThe size of the land the home sits on, from county records.
2009
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
7
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
2
ParkingThe number of parking spaces on the property, including the garage.

Valuation

$671K
$643K low$699K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$440,000 · Nov 8, 2017

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$1,715 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$40,440 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$7,190
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$33,250
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$45,630
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$647,000

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
CountyAdams
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.2015
Lot (acres)The size of the land the home sits on, from county records.0.14
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Forced Air
CoolingThe type of cooling or air conditioning in the home.Central
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
FeaturesExtra features found in county records. Records are not complete everywhere, so a missing feature does not always mean the home lacks it.Porch · 300 ft²

Transaction History(5)

Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.

Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.

E
Brantner Elementary SchoolB+
Elementary · Grades PK–5 · 0.5 mi
M
Quist Middle SchoolC+
Middle · Grades 6–8 · 1.1 mi
H
Riverdale Ridge High SchoolA-
High · Grades 9–12 · 1.2 mi

District: Brighton School District 27j

Neighborhood · ZIP 80602These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.

CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.28
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.88
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.44

Index scale: 100 = US average (tick). Lower is better.

Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.98%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.31%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.6%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.42,897
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,400 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$141,129
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$152,669
Average tempThe average temperature here across a full year.51°F
Annual precipHow much rain and melted snow falls here in a typical year.14 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.69%

Owner Tools

Do you own this home?
Claim this home

Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.

How this home compares

12870 Rosemary St measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.

  • Worth more than 86% of homes in Adams County
  • Bigger than 82% of homes in Adams County
  • Has a smaller lot than 92% of homes in The Villages at Riverdale
  • Newer than 79% of homes in Adams County

What homes are worth in Brighton 80602

Each bar is how many homes fall in that price range. The marker is this home.

This home
$348K$1.2M

This home is worth more than 49% of homes in Brighton 80602.

How it measures up in Brighton 80602

The dot is this home. The mark in the middle is the typical home in Brighton 80602.

Estimated value$670,986
CheaperTypical $673,255Pricier

Pricier than 49% of homes nearby

Price per ft²$287
CheaperTypical $291Pricier

Pricier than 47% of homes nearby

Living area2,335 ft²
SmallerTypical 2,280 ft²Bigger

Bigger than 53% of homes nearby

Lot size0.14 ac
SmallerTypical 0.17 acBigger

Bigger than 23% of homes nearby

Year built2009
OlderTypical 2007Newer

Newer than 55% of homes nearby

How 12870 Rosemary St ranks against every home in each area.
MeasureThis homeThe Villages at RiverdaleBrighton 80602Adams County
Estimated valuepricier than$670,98669% of homes49% of homes86% of homes
Price per ft²pricier than$28758% of homes47% of homes49% of homes
Living areabigger than2,335 ft²55% of homes53% of homes82% of homes
Lot sizebigger than0.14 ac8% of homes23% of homes29% of homes
Year builtnewer than200941% of homes55% of homes79% of homes

About 12870 Rosemary St

How much is 12870 Rosemary St, Thornton, CO worth?

The TopHap Estimate for 12870 Rosemary St, Thornton, CO is $670,986 as of Sep 24, 2026. The likely range is $643,022 to $698,950. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 12870 Rosemary St, Thornton, CO last sell?

12870 Rosemary St, Thornton, CO last sold on Nov 8, 2017 for $440,000, according to the county's recorded deed. TopHap holds 4 recorded sales for this parcel.

How big is 12870 Rosemary St, Thornton, CO?

12870 Rosemary St, Thornton, CO has 4 bedrooms, 4 bathrooms, 2,335 square feet of living space and a 0.14-acre lot.

When was 12870 Rosemary St, Thornton, CO built?

12870 Rosemary St, Thornton, CO was built in 2009, making it 17 years old. The building has 2 stories.

What schools serve 12870 Rosemary St, Thornton, CO?

12870 Rosemary St, Thornton, CO is assigned to Brantner Elementary School (elementary), rated B+; Quist Middle School (middle), rated C+; Riverdale Ridge High School (high), rated A-. All sit in Brighton School District 27j. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 12870 Rosemary St, Thornton, CO compare to other homes in Brighton 80602?

Among the 16,733 homes in Brighton 80602, it is worth more than 49% of them ($670,986 against a typical $673,255), its price per square foot is higher than 47% of them ($287 against a typical $291), it is bigger than 53% of them (2,335 ft² against a typical 2,280 ft²), its lot is bigger than 23% of them (0.14 ac against a typical 0.17 ac) and it is newer than 55% of them (2009 against a typical 2007). Measured against all of Adams County, it is worth more than 86% of homes there. These shares are recounted nightly from the full county assessor record for each area, not from active listings.

What are the property taxes on 12870 Rosemary St, Thornton, CO?

The 2025 property tax bill for 12870 Rosemary St, Thornton, CO was $1,715. The county assessed it at $40,440.

More homes on Rosemary St

Closest homes

More homes in Thornton 80602

Assigned schools

Explore the area

See this home in context

Open 12870 Rosemary St on TopHap’s interactive map to compare it against every sale nearby, overlay school zones and flood risk, and run a CMA.

Open in map
A flyover of TopHap's photorealistic 3D map, with recorded sale prices pinned to homes
Search any address, city, zip, or county…3D$1.9M$6.25MOpen in map