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Single Family ResidenceResidential
$383,980$236 / 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 95How well the pricing models agreed with each other on this home. Higher means the estimate rests on stronger, more consistent data.· as of Aug 30, 2026
Last sold for $150,000 on Mar 29, 2018

251 MAMMOTH SPRING RD

RENSSELAER, NY 12144
4
Beds
2.5
Baths
1,625 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.
1 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.
1
StoriesHow many floors the home has above ground.
8
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

$384K
$363K low$405K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$150,000 · Mar 29, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$9,513 (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.$41,800 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$4,000
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$37,800
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$41,800
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$261,250

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Single Family Residence
StyleThe architectural style of the home, such as ranch or colonial.Ranch
CountyRENSSELAER
Lot (acres)The size of the land the home sits on, from county records.1.00
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
FireplaceWhether the home has a fireplace, and what kind.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(1)

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

Neighborhood · ZIP 12144These 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.113
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.85
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.57

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.92%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.24%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.13%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.1%
PopulationHow many people live in this area.20,884
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,154 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$87,823
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$101,873
Average tempThe average temperature here across a full year.48°F
Annual precipHow much rain and melted snow falls here in a typical year.39 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.52%

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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

251 Mammoth Spring Rd 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 76% of homes in Rensselaer 12144
  • Costs more per square foot than 74% of homes in Rensselaer County
  • Has a bigger lot than 92% of homes in Rensselaer 12144
  • Newer than 95% of homes in Rensselaer 12144

What homes are worth in Rensselaer 12144

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

This home
$115K$708K

This home is worth more than 76% of homes in Rensselaer 12144.

How it measures up in Rensselaer 12144

The dot is this home. The mark in the middle is the typical home in Rensselaer 12144.

Estimated value$383,980
CheaperTypical $284,632Pricier

Pricier than 76% of homes nearby

Price per ft²$236
CheaperTypical $205Pricier

Pricier than 73% of homes nearby

Living area1,625 ft²
SmallerTypical 1,542 ft²Bigger

Bigger than 55% of homes nearby

Lot size1 ac
SmallerTypical 0.19 acBigger

Bigger than 92% of homes nearby

Year built2009
OlderTypical 1955Newer

Newer than 95% of homes nearby

How 251 Mammoth Spring Rd ranks against every home in each area.
MeasureThis homeRensselaer 12144Rensselaer County
Estimated valuepricier than$383,98076% of homes71% of homes
Price per ft²pricier than$23673% of homes74% of homes
Living areabigger than1,625 ft²55% of homes48% of homes
Lot sizebigger than1 ac92% of homes66% of homes
Year builtnewer than200995% of homes95% of homes

About 251 Mammoth Spring Rd

How much is 251 Mammoth Spring Rd, Rensselaer, NY worth?

The TopHap Estimate for 251 Mammoth Spring Rd, Rensselaer, NY is $383,980 as of Aug 30, 2026. The likely range is $362,954 to $405,006. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 251 Mammoth Spring Rd, Rensselaer, NY last sell?

251 Mammoth Spring Rd, Rensselaer, NY last sold on Mar 29, 2018 for $150,000, according to the county's recorded deed.

How big is 251 Mammoth Spring Rd, Rensselaer, NY?

251 Mammoth Spring Rd, Rensselaer, NY has 4 bedrooms, 2.5 bathrooms, 1,625 square feet of living space and a 1.00-acre lot.

When was 251 Mammoth Spring Rd, Rensselaer, NY built?

251 Mammoth Spring Rd, Rensselaer, NY was built in 2009, making it 17 years old. It is a ranch home. The building has 1 story.

How does 251 Mammoth Spring Rd, Rensselaer, NY compare to other homes in Rensselaer 12144?

Among the 6,575 homes in Rensselaer 12144, it is worth more than 76% of them ($383,980 against a typical $284,632), its price per square foot is higher than 73% of them ($236 against a typical $205), it is bigger than 55% of them (1,625 ft² against a typical 1,542 ft²), its lot is bigger than 92% of them (1 ac against a typical 0.19 ac) and it is newer than 95% of them (2009 against a typical 1955). Measured against all of Rensselaer County, it is worth more than 71% 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 251 Mammoth Spring Rd, Rensselaer, NY?

The 2025 property tax bill for 251 Mammoth Spring Rd, Rensselaer, NY was $9,513. The county assessed it at $41,800.

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