CondominiumResidential
435 William St
RIVER FOREST, IL 60305
0.74 ac
Lot SizeThe size of the land the home sits on, from county records.
2001
Year BuiltThe year the home was originally built, according to county records.
Built 20018 floors64 units1,435–4,475 ft²
$28M
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.
$402K
Median unit valueThe middle unit value in this building by our estimate: half the units are worth more, half less.
$223
Median $/ft²The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.
-24.2%vs the River Forest ZIP median sale $/ft² ($294)
Sales Performance
$435K
Median sale (12 mo)The middle sale price among this building's units that sold in the last 12 months, from recorded deeds.
+27.6%
1-yr changeHow the building's median sale price over the last 12 months compares with the 12 months before that.
3
Sales (12 mo)Units in this building that sold in the last 12 months, from recorded arms-length deeds.
4.7%
Turnover (12 mo)The share of units that changed hands in the last 12 months. Around 4–6% a year is typical; much higher can signal investor churn or a wave of exits.
This building's own appreciationThe building's own appreciation: for every unit that sold twice (held over a year), we compute its yearly price change between the two sales and take the middle value. This is the cleanest read on how this specific building performs, because it compares each unit to itself.
+1.8%per yeartypical hold 7.5 yrsfrom 33 same-unit resales
Median sale price (yearly, all time)Every recorded arms-length sale in the building since records begin, grouped by year: the bars count sales and the line tracks the median price paid.MedianSales
20022005200820112015201820222026
Sale price per ft² (yearly, all time)The middle price per square foot across the building's units, by our current estimates. Useful for comparing units of different sizes.$/ft²
20022005200820112015201820222026
81 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
12 units$325K · $225/ft²
2 bed
39 units$397K · $224/ft²
3 bed
13 units$566K · $205/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.
2 bd · 2 ba · 1,884 ft²
22 units$420K · $223/ft²
2 bd · 2 ba · 1,570 ft²
12 units$353K · $225/ft²
3 bd · 3 ba · 2,581 ft²
7 units$530K · $205/ft²
1 bd · 1 ba · 1,444 ft²
6 units$325K · $225/ft²
1 bd · 1 ba · 1,499 ft²
5 units$331K · $221/ft²
3 bd · 4 ba · 4,475 ft²
4 units$861K · $192/ft²
3 bd · 3 ba · 2,905 ft²
2 units$629K · $217/ft²
One-off layouts
6 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.
$301K–$363K
26 units
$379K–$445K
23 units
$458K–$503K
2 units
$529K–$577K
7 units
$604K–$655K
2 units
$861K–$905K
4 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 2
$229/ft²10 units · +3%
Floors 3–4
$218/ft²20 units · -2%
Floor 5
$219/ft²10 units · -2%
Floors 6–7
$219/ft²18 units · -2%
Floor 8
$217/ft²6 units · -3%
Unit lines by $/ft²Condo units stacked vertically share a unit line — the last digits of the unit number (like 05 in 1205, 1305, 1405). Lines share a layout and exposure, so comparing estimated $/ft² by line shows which position in the building commands a premium.
Line ·06
$233/ft²6 units · +4%
Line ·10
$228/ft²7 units · +3%
Line ·01
$224/ft²7 units · +0%
Line ·02
$223/ft²7 units · +0%
Line ·05
$222/ft²6 units · +0%
Line ·07
$220/ft²7 units · -1%
Line ·09
$216/ft²7 units · -3%
Line ·08
$212/ft²5 units · -5%
Line ·04
$209/ft²7 units · -6%
Line ·03
$209/ft²5 units · -6%
Ownership & Financing
Owner-occupiedThe share of units where the owner lives in the unit, per county records. The rest are second homes or rentals.80%
Company-ownedUnits owned through an LLC, trust, or other company — a rough proxy for investor ownership.25%
Typical owner tenureThe middle number of years since each unit last changed hands — how long the current owners have been in place.10.0 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.60%
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.37%
Median owner equityThe middle dollar amount of equity (value minus loans) unit owners hold in this building.$390,404
Median tax billThe middle annual property tax bill among the building's units.$7,887
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 802Jul 9, 2026$435,000$231/ft²Unit 607Jan 23, 2026$440,000$234/ft²Unit 205Jan 8, 2026$325,000$207/ft²Unit 606Dec 20, 2024$350,000$223/ft²Unit 609Nov 26, 2024$332,000$176/ft²Unit 309Apr 22, 2024$350,000$186/ft²Unit 208Apr 16, 2024$575,000$198/ft²Unit 210Apr 11, 2024$355,000$246/ft²Unit 407Mar 27, 2023$390,000$207/ft²Unit 304Mar 7, 2023$365,000$194/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.36
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.
69
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
67
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.0.74
HeatingThe type of heating system in the home.Radiant
CoolingThe type of cooling or air conditioning in the home.Central
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Attached
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.
MEH
Roosevelt SchoolA
Middle · Grades 5–8 · 0.4 mi
Lincoln Elementary SchoolA+
Elementary · Grades PK–4 · 0.5 mi
Oak Park & River Forest High SchoolA+
High · Grades 9–12 · 1.1 mi
District: Oak Park and River Forest District 200
Neighborhood · ZIP 60305These 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.29
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.133
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.45
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.94%
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.1.3%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.1.7%
PopulationHow many people live in this area.11,189
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.4,804 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$151,502
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$232,452
Average tempThe average temperature here across a full year.50°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.
435 William St Unit 201
1 bd · 1 ba · 1,499 ft²
435 William St Unit 202
2 bd · 2 ba · 1,884 ft²
435 William St Unit 203
3 bd · 3 ba · 2,905 ft²
435 William St Unit 204
2 bd · 2 ba · 1,560 ft²
435 William St Unit 205
2 bd · 2 ba · 1,570 ft²
435 William St Unit 206
2 bd · 2 ba · 1,570 ft²
435 William St Unit 207
2 bd · 2 ba · 1,563 ft²
435 William St Unit 208
3 bd · 3 ba · 2,905 ft²
435 William St Unit 209
2 bd · 2 ba · 1,884 ft²
435 William St # 210
1 bd · 1 ba · 1,444 ft²
435 William St Unit 301
1 bd · 1 ba · 1,499 ft²
435 William St Unit 302
2 bd · 2 ba · 1,884 ft²
435 William St Unit 303
2 bd · 2 ba · 2,581 ft²
435 William St Unit 304
2 bd · 2 ba · 1,884 ft²
435 William St Unit 305
2 bd · 2 ba · 1,570 ft²
435 William St Unit 306
2 bd · 2 ba · 1,570 ft²
435 William St Unit 307
2 bd · 2 ba · 1,884 ft²
435 William St Unit 308
3 bd · 3 ba · 2,581 ft²
435 William St Unit 309
2 bd · 2 ba · 1,884 ft²
435 William St Unit 310
1 bd · 1 ba · 1,444 ft²
435 William St Unit 401
1 bd · 1 ba · 1,499 ft²
435 William St # 402
2 bd · 2 ba · 1,884 ft²
435 William St # 403
3 bd · 3 ba · 2,581 ft²
435 William St Unit 404
2 bd · 2 ba · 1,884 ft²
435 William St Unit 405
2 bd · 2 ba · 1,570 ft²
435 William St Unit 406
2 bd · 2 ba · 1,570 ft²
435 William St Unit 407
2 bd · 2 ba · 1,884 ft²
435 William St Unit 408
3 bd · 3 ba · 2,581 ft²
435 William St Unit 409
2 bd · 2 ba · 1,884 ft²
435 William St Unit 410
1 bd · 1 ba · 1,444 ft²
435 William St Unit 501
1 bd · 1 ba · 1,435 ft²
435 William St Unit 502
2 bd · 2 ba · 1,884 ft²
435 William St Unit 503
3 bd · 3 ba · 2,581 ft²
435 William St Unit 504
2 bd · 2 ba · 1,884 ft²
435 William St # 505
2 bd · 2 ba · 1,570 ft²
435 William St Unit 506
2 bd · 2 ba · 1,570 ft²
435 William St Unit 507
2 bd · 2 ba · 1,884 ft²
435 William St Unit 508
3 bd · 3 ba · 2,581 ft²
435 William St Unit 509
2 bd · 2 ba · 1,884 ft²
435 William St Unit 510
1 bd · 1 ba · 1,444 ft²
435 William St # 601
1 bd · 1 ba · 1,499 ft²
435 William St Unit 602
2 bd · 2 ba · 1,884 ft²
435 William St Unit 603
3 bd · 3 ba · 2,581 ft²
435 William St Unit 604
2 bd · 2 ba · 1,884 ft²
435 William St Unit 605
2 bd · 2 ba · 1,570 ft²
435 William St Unit 606
2 bd · 2 ba · 1,570 ft²
435 William St Unit 607
2 bd · 2 ba · 1,884 ft²
435 William St Unit 608
3 bd · 3 ba · 2,581 ft²
435 William St # 609
2 bd · 2 ba · 1,884 ft²
435 William St # 610
1 bd · 1 ba · 1,444 ft²
435 William St Unit 701
1 bd · 1 ba · 1,499 ft²
435 William St Unit 702
2 bd · 2 ba · 1,884 ft²
435 William St Unit 704
3 bd · 4 ba · 4,475 ft²
435 William St Unit 705
2 bd · 2 ba · 1,570 ft²
435 William St Unit 706
2 bd · 2 ba · 1,570 ft²
435 William St Unit 707
3 bd · 4 ba · 4,475 ft²
435 William St Unit 709
2 bd · 2 ba · 1,884 ft²
435 William St Unit 710
1 bd · 1 ba · 1,444 ft²
435 William St Unit 801
2 bd · 2 ba · 1,592 ft²
435 William St # 802
2 bd · 2 ba · 1,884 ft²
435 William St Unit 804
3 bd · 4 ba · 4,475 ft²
435 William St Unit 807
3 bd · 4 ba · 4,475 ft²
435 William St Unit 809
2 bd · 2 ba · 1,884 ft²
435 William St Unit 810
2 bd · 2 ba · 1,555 ft²
Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.
About 435 William St
How many units are in 435 William St, River Forest, IL?
435 William St, River Forest, IL has 64 residential units across 8 floors, built in 2001, according to county assessor records.
What is a unit at 435 William St, River Forest, IL worth?
The median TopHap Estimate across the 64 units at 435 William St, River Forest, IL is $401,650. That works out to $223 per square foot. Units run from 1,435 to 4,475 square feet. Estimates are modelled from recorded sales and assessments, not appraisals.
Is 435 William St, River Forest, IL expensive for River Forest?
Units at 435 William St, River Forest, IL carry a median of $223 per square foot, 24% below the River Forest median of $294 per square foot.
How often do units sell at 435 William St, River Forest, IL?
3 units at 435 William St, River Forest, IL sold in the last 12 months, out of 81 recorded arms-length sales all time. That is a turnover rate of 4.7% of the building per year. The median sale over that period was $435K.
Have units at 435 William St, River Forest, IL appreciated?
Across 33 repeat sales of the same unit, 435 William St, River Forest, IL returned a median 1.8% 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 7.5 years.
What floor plans does 435 William St, River Forest, IL have?
The most common plan at 435 William St, River Forest, IL is a 2-bedroom of 1,884 square feet, repeated 22 times, with a median estimate of $419,606. TopHap identifies 7 recurring plans in the building.
Closest homes
- 435 William St$388K0 ft · 1 bd · 1 ba · 1,444 ft² · Sold $355K · Apr 2024
- 435 William St$309K0 ft · 1 bd · 1 ba · 1,444 ft² · Sold $274K · Jul 2021
- 435 William St Unit 801$361K0 ft · 2 bd · 2 ba · 1,592 ft² · Sold $220K · Dec 2008
- 435 William St Unit 201$346K0 ft · 1 bd · 1 ba · 1,499 ft² · Sold $250K · Jun 2021
- 435 William St Unit 608$566K0 ft · 3 bd · 3 ba · 2,581 ft² · Sold $423K · Mar 2006
- 435 William St Unit 202$429K0 ft · 2 bd · 2 ba · 1,884 ft² · Sold $345K · Aug 2006
- 435 William St$379K0 ft · 2 bd · 2 ba · 1,884 ft² · Sold $332K · Nov 2024
- 435 William St$397K0 ft · 2 bd · 2 ba · 1,884 ft² · Sold $181K · Dec 2011
More homes in River Forest 60305
- 1514 Park Ave$850K4 bd · 2.5 ba · 2,715 ft² · Sold $850K · Aug 2026
- 343 Franklin Ave$849K5 bd · 2.5 ba · 2,286 ft² · Sold $860K · Aug 2026
- 542 Jackson Ave$1M4 bd · 2.5 ba · 2,204 ft² · Sold $1.6M · Aug 2026
- 8021 Lake St$214K2 bd · 1 ba · 800 ft² · Sold $181K · Aug 2026
- 815 Franklin Ave$1.1M4 bd · 2 ba · 2,052 ft² · Sold $1.1M · Jul 2026
- 815 Franklin Ave$995K4 bd · 2 ba · 2,052 ft² · Sold $1.1M · Jul 2026
- 43 Forest Ave$589K3 bd · 3.5 ba · 2,283 ft² · Sold $589K · Jul 2026
- 407 Franklin Ave$271K2 bd · 2 ba · 1,780 ft² · Sold $339K · Jul 2026
- 410 Franklin Ave6 bd · 3 ba · 3,200 ft² · Sold $925K · Jul 2026
- 1523 Monroe Ave$635K3 bd · 2.5 ba · 1,244 ft² · Sold $50K · Jul 2026
- 411 Ashland Ave$361K2 bd · 2 ba · 1,925 ft² · Sold $280K · Jul 2026
- 935 Monroe Ave$850K4 bd · 3.5 ba · 2,680 ft² · Sold $850K · Jul 2026
Assigned schools
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