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TownhouseResidential
$607,704$254 / 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 91How 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 $430,840 on Nov 20, 2018

121 SENECA PL

MARS, PA 16046
2
Beds
3
Baths
2,392 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.
0.15 ac
Lot SizeThe size of the land the home sits on, from county records.
2018
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.

Valuation

$608K
$552K low$663K high
Last SaleThe most recent sale price and date from the recorded deed. Transfers between family members or companies may not reflect market value.$430,840 · Nov 20, 2018

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$2,306 (2026)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$358,600 (2026)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$54,100
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$304,500
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$358,600
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$376,600

Climate Risk

Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.39
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
7
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
71
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
83
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
36
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Townhouse
StyleThe architectural style of the home, such as ranch or colonial.Townhouse
CountyALLEGHENY
Lot (acres)The size of the land the home sits on, from county records.0.15
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
HeatingThe type of heating system in the home.Central
CoolingThe type of cooling or air conditioning in the home.Central
PoolWhether the property has a pool, and what kind, such as in-ground.No

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

E
Marshall Elementary SchoolA+
Elementary · Grades KG–5 · 1.9 mi
M
Marshall Middle SchoolA-
Middle · Grades 6–8 · 2.0 mi
H
North Allegheny High SchoolA+
High · Grades 9–12 · 5.0 mi

District: North Allegheny School District

Neighborhood · ZIP 16046These 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.55
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.96
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.24

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.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.36%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.3%
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.20,196
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.885 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$131,280
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$161,207
Average tempThe average temperature here across a full year.50°F
Annual precipHow much rain and melted snow falls here in a typical year.40 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.45%

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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

121 Seneca Pl 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 92% of homes in Allegheny County
  • Costs more per square foot than 89% of homes in Allegheny County
  • Bigger than 85% of homes in Allegheny County
  • Has a smaller lot than 67% of homes in Mars 16046
  • Newer than 98% of homes in Allegheny County

What homes are worth in Mars 16046

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

This home
$153K$1.5M

This home is worth more than 61% of homes in Mars 16046.

How it measures up in Mars 16046

The dot is this home. The mark in the middle is the typical home in Mars 16046.

Estimated value$607,704
CheaperTypical $530,204Pricier

Pricier than 61% of homes nearby

Price per ft²$254
CheaperTypical $232Pricier

Pricier than 68% of homes nearby

Living area2,392 ft²
SmallerTypical 2,426 ft²Bigger

Bigger than 49% of homes nearby

Lot size0.15 ac
SmallerTypical 0.29 acBigger

Bigger than 33% of homes nearby

Year built2018
OlderTypical 2005Newer

Newer than 86% of homes nearby

How 121 Seneca Pl ranks against every home in each area.
MeasureThis homeMars 16046Allegheny County
Estimated valuepricier than$607,70461% of homes92% of homes
Price per ft²pricier than$25468% of homes89% of homes
Living areabigger than2,392 ft²49% of homes85% of homes
Lot sizebigger than0.15 ac33% of homes44% of homes
Year builtnewer than201886% of homes98% of homes

About 121 Seneca Pl

How much is 121 Seneca Pl, Mars, PA worth?

The TopHap Estimate for 121 Seneca Pl, Mars, PA is $607,704 as of Sep 24, 2026. The likely range is $552,017 to $663,391. The estimate is modelled from recorded sales, assessments and the property's own characteristics — it is not an appraisal.

When did 121 Seneca Pl, Mars, PA last sell?

121 Seneca Pl, Mars, PA last sold on Nov 20, 2018 for $430,840, according to the county's recorded deed.

How big is 121 Seneca Pl, Mars, PA?

121 Seneca Pl, Mars, PA has 2 bedrooms, 3 bathrooms, 2,392 square feet of living space and a 0.15-acre lot.

When was 121 Seneca Pl, Mars, PA built?

121 Seneca Pl, Mars, PA was built in 2018, making it 8 years old. It is a townhouse home. The building has 2 stories.

What schools serve 121 Seneca Pl, Mars, PA?

121 Seneca Pl, Mars, PA is assigned to Marshall Elementary School (elementary), rated A+; Marshall Middle School (middle), rated A-; North Allegheny High School (high), rated A+. All sit in North Allegheny School District. Attendance boundaries change — confirm with the district before relying on an assignment.

How does 121 Seneca Pl, Mars, PA compare to other homes in Mars 16046?

Among the 7,633 homes in Mars 16046, it is worth more than 61% of them ($607,704 against a typical $530,204), its price per square foot is higher than 68% of them ($254 against a typical $232), it is bigger than 49% of them (2,392 ft² against a typical 2,426 ft²), its lot is bigger than 33% of them (0.15 ac against a typical 0.29 ac) and it is newer than 86% of them (2018 against a typical 2005). Measured against all of Allegheny County, it is worth more than 92% 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 121 Seneca Pl, Mars, PA?

The 2026 property tax bill for 121 Seneca Pl, Mars, PA was $2,306. The county assessed it at $358,600.

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