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3525 S Cass Ct

OAK BROOK, IL 60523
6.42 ac
Lot SizeThe size of the land the home sits on, from county records.
1993
Year BuiltThe year the home was originally built, according to county records.
Built 19916 floors24 units1,660–2,850 ft²
$9.8M
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.
$420K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$200
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.

-28.0%vs the Oak Brook ZIP median sale $/ft² ($278)

Sales Performance

—
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
—
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
0
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
0.0%
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.
+1.0%per yeartypical hold 8.9 yrsfrom 34 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
19982002200520102013201720212025
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
19982002200520102013201720212025

57 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.
$343K$392K$441K$490K1,660 ft²1,898 ft²2,136 ft²2,374 ft²2,612 ft²2,850 ft²
Studio2 bd
Studio
15 units
2 bed
9 units
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.
Studio · 0 ba · 2,300 ft²
5 units
Studio · 0 ba · 1,687 ft²
4 units
2 bd · 2.5 ba · 2,200 ft²
2 units
2 bd · 2.5 ba · 2,300 ft²
2 units
One-off layouts
11 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.

$343K–$356K
6 units
$364K–$372K
2 units
$392K–$392K
1 unit
$412K–$412K
1 unit
$419K–$434K
8 units
$436K–$443K
4 units
$482K–$490K
2 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.

Floor 3
$204/ft²
Floor 4
$198/ft²
Floor 5
$189/ft²
Floor 6
$184/ft²

Ownership & Financing

Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.67%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.38%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.7.7 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.23%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$445,692
Median tax billThe middle annual property tax bill among the building's units.$6,674
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 418Sep 3, 2025$430,000Unit 309Jun 24, 2025$465,000Unit 504Jul 19, 2024$375,000Unit 613Jul 1, 2024$400,000Unit T3NDec 20, 2023$394,500Unit 300Nov 6, 2023$361,000Unit T4NFeb 14, 2023$409,000Unit 309Aug 30, 2022$335,000Unit 300Apr 12, 2022$315,000Unit 416Sep 21, 2021$295,000

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

Climate Risk

Projected Flood DepthHow deep a serious flood is expected to get here at some point in the next 30 years. Shown in inches.60 in
30-Year Flood ChanceThe chance of at least one serious flood here in the next 30 years, not in any single year.30%
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.Condominium
StyleThe architectural style of the home, such as ranch or colonial.Condo/Apartment
CountyDUPAGE
ConstructionThe main material the home's frame and walls are built from.Brick
HeatingThe type of heating system in the home.Yes
CoolingThe type of cooling or air conditioning in the home.Central
FireplaceWhether the home has a fireplace, and what kind.Yes
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.

M
Westmont Jr High SchoolA
Middle · Grades 6–8 · 0.7 mi
H
Westmont High SchoolA
High · Grades 9–12 · 0.9 mi
E
C E Miller Elementary School
Elementary · Grades KG–1 · 1.1 mi

District: Westmont Community Unit School District 201

Neighborhood · ZIP 60523These 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.118
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.128
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.50

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.34%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.9.4%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.0%
PopulationHow many people live in this area.9,904
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.1,095 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$125,416
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$174,441
Average tempThe average temperature here across a full year.49°F
Annual precipHow much rain and melted snow falls here in a typical year.38 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.

3525 S Cass Ct # T2n
2,103 ft²
$419K
3525 S Cass Ct # T3n
2 bd · 2,103 ft²
$434K
3525 S Cass Ct # T4n
2 bd · 2.5 ba · 2,103 ft²
$443K
3525 S Cass Ct # 300
1,890 ft²
$392K
3525 S Cass Ct # 301
2 bd · 1,680 ft²
$356K
3525 S Cass Ct # 304
1,687 ft²
$343K
3525 S Cass Ct # 309
2 bd · 2.5 ba · 2,300 ft²
$482K
3525 S Cass Ct # 310
2,300 ft²
$431K
3525 S Cass Ct # 402
1,660 ft²
$348K
3525 S Cass Ct # 403
1,848 ft²
$372K
3525 S Cass Ct # 405
1,687 ft²
$352K
3525 S Cass Ct # 406
1,687 ft²
$353K
3525 S Cass Ct # 407
2 bd · 2 ba · 1,687 ft²
$364K
3525 S Cass Ct # 415
2,300 ft²
$431K
3525 S Cass Ct # 416
2 bd · 2.5 ba · 2,200 ft²
$436K
3525 S Cass Ct # 418
2,850 ft²
$442K
3525 S Cass Ct # 504
1,687 ft²
$347K
3525 S Cass Ct # 509
2,300 ft²
$419K
3525 S Cass Ct # 514
2,300 ft²
$439K
3525 S Cass Ct # 516
2,200 ft²
$412K
3525 S Cass Ct # 517
2 bd · 2.5 ba · 2,200 ft²
$432K
3525 S Cass Ct # 518
2 bd · 2.5 ba · 2,850 ft²
$490K
3525 S Cass Ct # 613
2 bd · 2.5 ba · 2,300 ft²
$427K
3525 S Cass Ct # 614
2,300 ft²
$422K

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

About 3525 S Cass Ct

How many units are in 3525 S Cass Ct, Oak Brook, IL?

3525 S Cass Ct, Oak Brook, IL has 24 residential units across 6 floors, built in 1991, according to county assessor records.

What is a unit at 3525 S Cass Ct, Oak Brook, IL worth?

The median TopHap Estimate across the 24 units at 3525 S Cass Ct, Oak Brook, IL is $420,399. That works out to $200 per square foot. Units run from 1,660 to 2,850 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.

Is 3525 S Cass Ct, Oak Brook, IL expensive for Oak Brook?

Units at 3525 S Cass Ct, Oak Brook, IL carry a median of $200 per square foot, 28% below the Oak Brook median of $278 per square foot.

How often do units sell at 3525 S Cass Ct, Oak Brook, IL?

0 units at 3525 S Cass Ct, Oak Brook, IL sold in the last 12 months, out of 57 recorded arms-length sales all time. That is a turnover rate of 0.0% of the building per year.

Have units at 3525 S Cass Ct, Oak Brook, IL appreciated?

Across 34 repeat sales of the same unit, 3525 S Cass Ct, Oak Brook, IL returned a median 1.0% 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 8.9 years.

What floor plans does 3525 S Cass Ct, Oak Brook, IL have?

The most common plan at 3525 S Cass Ct, Oak Brook, IL is a 0-bedroom of 2,300 square feet, repeated 5 times, with a median estimate of $430,733. TopHap identifies 4 recurring plans in the building.

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