CondominiumResidential
20 S Main St
MOUNT PROSPECT, IL 60056
2.77 ac
Lot SizeThe size of the land the home sits on, from county records.
2000
Year BuiltThe year the home was originally built, according to county records.
Built 200037 floors70 units960–1,980 ft²
$26M
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.
$367K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$253
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.
-4.6%vs the Mount Prospect ZIP median sale $/ft² ($265)
Sales Performance
$353K
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
+10.2%
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
3
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
4.3%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+0.8%per yeartypical hold 5.2 yrsfrom 35 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
20042007201120142017202020232026
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
20042007201120142017202020232026
97 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.
1 bd2 bd3 bd
1 bed
16 units$315K · $275/ft²
2 bed
45 units$377K · $252/ft²
3 bed
9 units$426K · $240/ft²
Recurring 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.
1 bd · 0 ba · 960 ft²
2 units$280K · $292/ft²
2 bd · 0 ba · 1,504 ft²
2 units$357K · $237/ft²
One-off layouts
66 units
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.
$264K–$295K
4 units
$297K–$324K
11 units
$333K–$364K
20 units
$370K–$395K
17 units
$399K–$426K
11 units
$473K–$499K
4 units
$501K–$532K
3 units
Value by Floor & LineAverage estimated price per square foot by floor range, using unit numbers to infer floors. Higher floors usually price higher — the gap shows how much the view is worth here.
Floors 5–6
$246/ft²2 units · -2%
Floors 32–37
$256/ft²13 units · +1%
Ownership & Financing
Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.23%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.33%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.8.9 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.48%
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.38%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$383,504
Median tax billThe middle annual property tax bill among the building's units.$6,217
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 3-509Jan 5, 2026$365,000$228/ft²Unit 3-312Jan 5, 2026$352,500Unit 3-301Dec 5, 2025$305,000Unit 3-506Aug 26, 2025$295,000$224/ft²Unit 3-403Mar 25, 2025$391,500Unit 3-302Mar 19, 2025$315,000Unit 3-608Mar 5, 2025$315,000Unit 3-701Feb 6, 2025$457,500Unit 405Jan 16, 2025$320,000Unit 3-308Dec 2, 2024$340,000$226/ft²
Values are TopHap estimates, not appraisals. Sales, ownership and tax figures come from recorded county documents via ATTOM and can lag by several weeks.
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.35
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
1
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
62
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
66
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
45
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
CountyCOOK
Lot (acres)The size of the land the home sits on, from county records.2.77
HeatingThe type of heating system in the home.Forced Air With Air Conditioning
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.
MHE
Lincoln Middle SchoolB+
Middle · Grades 6–8 · 0.6 mi
Prospect High SchoolA+
High · Grades 9–12 · 1.1 mi
Westbrook Early Learning Center
Elementary · Grades PK–1 · 1.1 mi
District: Mount Prospect School District 57
Neighborhood · ZIP 60056These 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.59
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.124
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.43
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.96%
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.4.7%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.8%
PopulationHow many people live in this area.56,070
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.5,043 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$99,966
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$121,404
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.37 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.54%
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.
20 S Main St # 205
2 bd · 2 ba
20 S Main St # 305
2 bd
20 S Main St # 405
2 bd
20 S Main St # 503
2 bd
20 S Main St Apt 505
2 bd · 1,504 ft²
20 S Main St # 605
2 bd · 2 ba · 1,504 ft²
20 S Main St # 3-201
1 bd · 960 ft²
20 S Main St # 3-202
1 bd
20 S Main St # 3-203
2 bd
20 S Main St # 3-204
2 bd
20 S Main St # 3-206
1 bd
20 S Main St # 3-207
2 bd
20 S Main St # 3-208
2 bd
20 S Main St # 3209
2 bd · 4 ba · 1,598 ft²
20 S Main St # 3-210
2 bd
20 S Main St # 3-211
2 bd
20 S Main St # 3-212
2 bd · 1,630 ft²
20 S Main St # 3-301
1 bd · 1 ba
20 S Main St # 3-302
2 bd
20 S Main St # 3-303
2 bd · 2 ba
20 S Main St # 3-304
2 bd
20 S Main St # 3-306
1 bd
20 S Main St # 3-307
2 bd
20 S Main St # 3-308
2 bd · 1,504 ft²
20 S Main St # 3-309
2 bd
20 S Main St # 3-310
2 bd
20 S Main St # 3-311
1 bd
20 S Main St # 3-312
2 bd · 2 ba
20 S Main St # 3-401
1 bd
20 S Main St # 3-402
2 bd
20 S Main St # 3-403
2 bd · 2 ba
20 S Main St # 3-404
2 bd
20 S Main St # 3-406
1 bd · 1.5 ba
20 S Main St # 3-407
3 bd
20 S Main St # 3-408
2 bd
20 S Main St # 3-409
2 bd
20 S Main St # 3-410
2 bd
20 S Main St # 3-411
1 bd
20 S Main St # 3-412
2 bd · 2 ba
20 S Main St # 3-501
1 bd
20 S Main St # 3502
2 bd · 1 ba · 1,216 ft²
20 S Main St # 3-504
2 bd · 1,574 ft²
20 S Main St # 3-506
1 bd · 1,315 ft²
20 S Main St # 3-507
2 bd · 1,980 ft²
20 S Main St # 3-508
2 bd
20 S Main St # 3-509
2 bd · 1,598 ft²
20 S Main St # 3-510
2 bd · 1,500 ft²
20 S Main St # 3-511
1 bd
20 S Main St # 3-512
2 bd
20 S Main St # 3-601
3 bd
20 S Main St # 3-603
3 bd
20 S Main St # 3-604
2 bd
20 S Main St # 3-606
1 bd · 1.5 ba
20 S Main St # 3-607
3 bd
20 S Main St # 3-608
2 bd
20 S Main St # 3-609
2 bd
20 S Main St # 3-610
3 bd
20 S Main St # 3-611
1 bd
20 S Main St # 3-612
2 bd
20 S Main St # 3-701
3 bd
20 S Main St # 3-703
3 bd
20 S Main St # 3-704
2 bd
20 S Main St # 3-705
2 bd
20 S Main St # 3-706
1 bd · 1,175 ft²
20 S Main St # 3-707
3 bd
20 S Main St # 3-708
2 bd
20 S Main St # 3-709
2 bd
20 S Main St # 3-710
3 bd · 1,740 ft²
20 S Main St # 3-711
1 bd · 960 ft²
20 S Main St # 3-712
2 bd
Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.
About 20 S Main St
How many units are in 20 S Main St, Mount Prospect, IL?
20 S Main St, Mount Prospect, IL has 70 residential units across 37 floors, built in 2000, according to county assessor records.
What is a unit at 20 S Main St, Mount Prospect, IL worth?
The median TopHap Estimate across the 70 units at 20 S Main St, Mount Prospect, IL is $366,908. That works out to $253 per square foot. Units run from 960 to 1,980 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.
Is 20 S Main St, Mount Prospect, IL expensive for Mount Prospect?
Units at 20 S Main St, Mount Prospect, IL carry a median of $253 per square foot, 5% below the Mount Prospect median of $265 per square foot.
How often do units sell at 20 S Main St, Mount Prospect, IL?
3 units at 20 S Main St, Mount Prospect, IL sold in the last 12 months, out of 97 recorded arms-length sales all time. That is a turnover rate of 4.3% of the building per year. The median sale over that period was $353K.
Have units at 20 S Main St, Mount Prospect, IL appreciated?
Across 35 repeat sales of the same unit, 20 S Main St, Mount Prospect, IL returned a median 0.8% 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 5.2 years.
What floor plans does 20 S Main St, Mount Prospect, IL have?
The most common plan at 20 S Main St, Mount Prospect, IL is a 1-bedroom of 960 square feet, repeated 2 times, with a median estimate of $280,357. TopHap identifies 2 recurring plans in the building.
More homes on S Main St
- 506 S Main St$569K3 bd · 2 ba · 1,290 ft² · Sold $567K · Aug 2026
- 311 S Main St$493K2 bd · 1 ba · 1,092 ft² · Sold $480K · Mar 2026
- 20 S Main St # 3-509$374K2 bd · 1,598 ft² · Sold $365K · Jan 2026
- 20 S Main St # 3-312$361K2 bd · 2 ba · 2.77 ac · Sold $353K · Jan 2026
- 20 S Main St # 3-301$313K1 bd · 1 ba · 2.77 ac · Sold $305K · Dec 2025
- 20 S Main St # 3-506$307K1 bd · 1,315 ft² · Sold $295K · Aug 2025
- 20 S Main St # 3-403$414K2 bd · 2 ba · 2.77 ac · Sold $392K · Mar 2025
- 20 S Main St # 3-302$333K2 bd · 2.77 ac · Sold $315K · Mar 2025
- 20 S Main St # 3-608$333K2 bd · 2.77 ac · Sold $315K · Mar 2025
- 20 S Main St # 3-701$486K3 bd · 2.77 ac · Sold $458K · Feb 2025
- 20 S Main St # 405$341K2 bd · 2.77 ac · Sold $320K · Jan 2025
- 510 S Main St$410K3 bd · 1 ba · 1,244 ft² · Sold $374K · Jan 2025
Closest homes
- 5 W Central Rd$286K0 ft · 1 bd · 2.77 ac · Sold $260K · May 2024
- 5 W Central Rd$481K0 ft · 3 bd · 2.77 ac · Sold $315K · Apr 2008
- 5 W Central Rd Apt 112$262K0 ft · 1 bd · 917 ft² · Sold $171K · Oct 2020
- 11 S Wille St$331K0 ft · 2 bd · 2.77 ac · Sold $243K · Oct 2004
- 20 S Main St$380K0 ft · 2 bd · 2.77 ac · Sold $215K · Aug 2019
- 5 W Central Rd Apt 309$447K0 ft · 3 bd · 2 ba · 1,805 ft² · Sold $205K · Jul 2011
- 20 S Main St$399K0 ft · 2 bd · 2.77 ac · Sold $265K · Mar 2018
- 5 W Central Rd Apt 209$436K0 ft · 3 bd · 1,805 ft² · Sold $319K · Dec 2020
More homes in Mount Prospect 60056
- 1220 N Wheeling Rd$325K3 bd · 1.5 ba · 1,169 ft² · Sold $325K · Sep 2026
- 10 S Wille St$280K1 bd · 1.21 ac · Sold $280K · Sep 2026
- 1304 E Central Rd$426K3 bd · 1 ba · 1,196 ft² · Sold $175K · Sep 2026
- 1103 S Hunt Club Dr$252K2 bd · 1,163 ft² · Sold $252K · Sep 2026
- 1408 S Fern Dr$450K3 bd · 1.5 ba · 1,248 ft² · Sold $438K · Sep 2026
- 513 E Highland Ave$415K2 bd · 1.5 ba · 1,206 ft² · Sold $320K · Sep 2026
- 206 S Owen St$513K2 bd · 1 ba · 1,015 ft² · Sold $511K · Sep 2026
- 301 N Catino Ct6 bd · 4 ba · 4,022 ft² · Sold $620K · Sep 2026
- 206 S Owen St$333K2 bd · 1 ba · 1,015 ft² · Sold $511K · Sep 2026
- 1432 N Picadilly Cir$474K3 bd · 2.5 ba · 1,821 ft² · Sold $467K · Sep 2026
- 1121 N Greenfield Ln$705K4 bd · 2.5 ba · 2,313 ft² · Sold $530K · Sep 2026
- 748 Dempster St$240K2 bd · 1,443 ft² · Sold $200K · Sep 2026
Assigned schools
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