Skip to content
Skip to content
TopHapOpen in map
CondominiumResidential
Last sold for $77,000 on Nov 10, 2014

417 PROSPECT ST

ALTON, IL 62002
0.88 ac
Lot SizeThe size of the land the home sits on, from county records.
2
StoriesHow many floors the home has above ground.
16 units606–1,409 ft²
$1.8M
All units combinedThe sum of our current value estimates for every unit in the building — roughly what the whole building's homes are worth together.
$122K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$120
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.

-1.7%vs the Alton ZIP median sale $/ft² ($122)

Sales Performance

$152K
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
+200.5%
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
2
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
12.5%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+2.2%per yeartypical hold 5.1 yrsfrom 21 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
19982001200520092013201620192025
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
19982001200520092013201620192025

39 arms-length sales on record for this building.

Unit Mix & Floor PlansThe building's recurring floor plans, found by grouping units with identical beds, baths and square footage in county records. Larger groups are the building's standard layouts; leftover units have one-off sizes.

Every unit: size vs estimated valueEvery unit in the building as one dot: across is its size, up is our current value estimate, and color is its bedroom count. Vertical columns of dots are recurring floor plans; the height spread within a column shows how much floor, view and condition move prices for the same layout.
$53K$93K$132K$172K606 ft²767 ft²927 ft²1,088 ft²1,248 ft²1,409 ft²
Studio2 bd
Studio
15 units
2 bed
1 unit

Value DistributionHow the building's units spread across value ranges by our current estimates. A wide spread usually means big differences in size, floor or view.

$53K–$60K
2 units
$74K–$74K
1 unit
$86K–$93K
3 units
$98K–$98K
1 unit
$118K–$125K
2 units
$129K–$131K
3 units
$153K–$153K
1 unit
$157K–$172K
3 units

Ownership & Financing

Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.75%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.19%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.14.7 yrs
Cash purchases (5 yrs)The share of purchases in the last 5 years with no mortgage recorded. High cash share is common in second-home and investor buildings.67%
Avg. loan-to-valueAverage current loan balance against unit value across the building. Low numbers mean owners hold lots of equity — a sign of financial stability.30%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$118,092
Median tax billThe middle annual property tax bill among the building's units.$2,487
Pre-foreclosure noticesUnits with an active pre-foreclosure or foreclosure notice on file.0

Recent SalesThe latest recorded arms-length sales in the building, newest first.

Unit DSep 15, 2025$150,000Unit AAug 29, 2025$153,500Unit CSep 10, 2024$50,500Unit ADec 4, 2020$110,000Unit HDec 4, 2020$70,000Unit JOct 30, 2019$90,000BuildingApr 23, 2018$58,000BuildingDec 9, 2016$78,500Unit ANov 5, 2015$98,500Unit MJun 24, 2015$45,000

Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.

Tax & Assessment

Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$3,950 (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.$49,350 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$1,290
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$48,060
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$44,640
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$148,050

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.34
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
14
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
83
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
70
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
4
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.

Scores 0–100; higher = greater projected risk.

Property Facts

Property TypeThe broad category the county puts this property in, such as residential or commercial.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyMADISON
Lot (acres)The size of the land the home sits on, from county records.0.88
RoofThe main material covering the roof, such as asphalt shingle or tile.Shingle
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Yes
PoolWhether the property has a pool, and what kind, such as in-ground.No

Transaction History(2)

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.

M
Alton Middle SchoolC-
Middle · Grades 6–8 · 2.0 mi
E
Gilson Brown Elementary School
Elementary · Grades KG–1 · 2.9 mi
H
Alton High SchoolD+
High · Grades 9–12 · 3.3 mi

District: Alton Community Unit School District 11

Neighborhood · ZIP 62002These 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.135
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 100.125

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.89%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.16%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.19%
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.28,813
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.738 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$61,207
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$78,082
Average tempThe average temperature here across a full year.55°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.59%

Ownership

OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Absentee owner
Company ownedWhether the owner is a company or trust rather than a person.No

All UnitsEvery property record the county has at this street address, such as the units in a condo building. Prices shown are our estimates, not asking prices.

417 Prospect St
746 ft²
$104K
417 Prospect St
862 ft²
$85K
417 Prospect St
1,684 ft²
$107K
417 Prospect St
1,359 ft²
$105K
417 Prospect St
949 ft²
$88K
417 Prospect St
1,306 ft²
$105K
417 Prospect St # A
1,409 ft²
$157K
417 Prospect St # B
606 ft²
$60K
417 Prospect St
1,014 ft²
$53K
417 Prospect St # D
2 bd · 2 ba · 923 ft²
$153K
417 Prospect St # F
754 ft²
$98K
417 Prospect St # G
1,198 ft²
$164K
417 Prospect St # H
797 ft²
$125K
417 Prospect St # I
742 ft²
$118K
417 Prospect St # J
1,010 ft²
$129K
417 Prospect St # M
766 ft²
$74K
417 Prospect St
846 ft²
$90K
417 Prospect St # Q
861 ft²
$86K
417 Prospect St
1,312 ft²
$131K
417 Prospect St # U
947 ft²
$93K
417 Prospect St # V
1,117 ft²
$172K
417 Prospect St # X
964 ft²
$130K

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

About 417 Prospect St

How many units are in 417 Prospect St, Alton, IL?

417 Prospect St, Alton, IL has 16 residential units, according to county assessor records.

What is a unit at 417 Prospect St, Alton, IL worth?

The median TopHap Estimate across the 16 units at 417 Prospect St, Alton, IL is $121,598. That works out to $120 per square foot. Units run from 606 to 1,409 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.

Is 417 Prospect St, Alton, IL expensive for Alton?

Units at 417 Prospect St, Alton, IL carry a median of $120 per square foot, 2% below the Alton median of $122 per square foot.

How often do units sell at 417 Prospect St, Alton, IL?

2 units at 417 Prospect St, Alton, IL sold in the last 12 months, out of 39 recorded arms-length sales all time. That is a turnover rate of 12.5% of the building per year. The median sale over that period was $152K.

Have units at 417 Prospect St, Alton, IL appreciated?

Across 21 repeat sales of the same unit, 417 Prospect St, Alton, IL returned a median 2.2% per year. Because each pair is the same unit bought and sold, the figure is not distorted by which units traded. The median owner held for 5.1 years.

Closest homes

More homes in Alton 62002

Assigned schools

Explore the area

See this home in context

Open 417 Prospect 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