21 S William St, Mount Prospect, IL 60056
OFF MARKET

$472,400

Trulia Estimate
  • 3 Beds
  • 1.5 Baths
  • 1,581 sqft

21 S William St, Mount Prospect, IL 60056

Est. Refi. Payment $3,362/mo*
Refinance Your Home
Currently Off Market - Sold Feb 28, 1994 for $189,000

Home Value

Trulia Estimate
$472K
Since last month
Decreased$7K (-1.4%)
Since last year
Increased$31K (+6.9%)
Since last sale
Increased$289K (+153.1%)
Learn more about this home's value by checking out its Trulia Estimate, the value of nearby homes, and how much similar homes have sold for.

Trulia Estimate

The of this home's value increased by +46% in the last 10 years
MonthEstimated value
2026
September 2026$478K
August 2026$476K
July 2026$485K
June 2026$493K
May 2026$493K
April 2026$477K
March 2026$461K
February 2026$441K
January 2026$434K
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016

Comparable sales

These are recently sold homes that have a similar location or other similar features to this home, like bedrooms, bathrooms, and square footage. Get a sense of the expected prices in the area by viewing these homes.
Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
14 N Edward St, Mount Prospect, IL
0.23
Single-Family Home
$360,000
01/21/26
3
2
1,688
118 S William St, Mount Prospect, IL
0.12
Single-Family Home
$405,000
01/09/26
3
1.5
1,215
1 N Edward St, Mount Prospect, IL
0.19
Single-Family Home
$369,000
08/26/26
3
2
1,500
203 S Edward St, Mount Prospect, IL
0.21
Single-Family Home
$485,000
08/27/26
3
1.5
1,210
114 S Elm St, Mount Prospect, IL
0.27
Single-Family Home
$595,000
05/20/26
3
2
1,554
214 S Mount Prospect Rd, Mount Prospect, IL
0.38
Single-Family Home
$377,000
11/05/25
3
2
1,312
324 S Mount Prospect Rd, Mount Prospect, IL
0.50
Single-Family Home
$331,000
08/10/26
3
1
1,545
206 S Owen St, Mount Prospect, IL
0.20
Single-Family Home
$511,000
08/17/26
4
2
1,118
114 N Elm St, Mount Prospect, IL
0.42
Single-Family Home
$400,000
06/04/26
3
2
1,987
110 S Mount Prospect Rd, Mount Prospect, IL
0.33
Single-Family Home
$470,000
11/11/25
3
2.5
1,377

Nearby home prices

Get a sense of expected prices in the area by checking the value of nearby homes.
Address
Distance
Price
Bed
Bath
Sqft
Status
22 S Louis St, Mount Prospect, IL 60056
0.03
$640,600
4
1.5
1,824
Off Market
6 S Louis St, Mount Prospect, IL 60056
0.08
$563,900
3
2.5
1,900
Off Market
700 E Busse Ave, Mount Prospect, IL 60056
0.07
$592,600
3
3
1,735
Off Market
14 S Owen St, Mount Prospect, IL 60056
0.12
$927,300
6
4
2,624
Off Market
117 S William St, Mount Prospect, IL 60056
0.10
$576,600
3
2.5
1,700
Off Market
118 S William St, Mount Prospect, IL 60056
0.12
$405,000
3
1.5
1,215
Recently Sold
3 S School St, Mount Prospect, IL 60056
0.16
$392,000
2
1
1,008
Recently Sold
118 S Edward St, Mount Prospect, IL 60056
0.15
$501,500
3
2
1,472
Off Market
14 S George St, Mount Prospect, IL 60056
0.18
$803,100
4
2.5
2,520
Off Market
1 N Edward St, Mount Prospect, IL 60056
0.19
$369,000
3
2
1,500
Recently Sold
1 N School St, Mount Prospect, IL 60056
0.19
$622,800
3
3
2,090
Off Market
11 N Owen St, Mount Prospect, IL 60056
0.21
$467,400
3
1
1,382
Off Market

Local Information

  • Map ViewExplore the area around 21 S William St.
  • Schools1 Preschool School2 Elementary Schools1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Single-Family Home
Built in 1941
1,581 sqft
$299/sqft
Garage

About this House

Well-known corner lot home, centrally located in the historic "Small Triangle" area of Mount Prospect, 1 block from Owen Park, 2 blocks from St Paul Lutheran Church & School (PreK - 8), 4 blocks from library/village hall/downtown shopping, 4 blocks from the Metra train station. Natural gas-fed custom-built Weber BBQ grill. Stainless steel appliances include Bosch, Liebherr, Viking, and a custom 22K BTU BlueStar Professional gas range with integrated flat-top grill and custom dual fan exhaust. Home utility power and cable lines are buried to reduce the potential for outages and supplemented by a natural gas-fed Generac automatic, whole-house generator.
21 S William St, Mount Prospect, IL 60056 is a 3 bedroom, 2 bathroom, 1,581 sqft single-family home built in 1941. It last sold for $189,000 on Feb 28, 1994. This property is not currently displayed as for sale or rent on Trulia. The Trulia Estimate is $472,400, with a rent estimate of $3,341/month.

Home Details for 21 S William St

Interior Features

Interior Details
BasementAtticNumber of Rooms: 6Types of Rooms: Dining Room, Family Room, Laundry Room, Workshop, Sun RoomCeiling Fan
Heating & Cooling
Heating: Forced Air, GasAir ConditioningCooling System: CentralHeating Fuel: Forced Air
Levels, Entrance, & Accessibility
Stories: 2Floors: Hardwood
Appliances & Utilities
Cable ReadyDishwasherDisposalDryerMicrowaveRefrigeratorWasher
Fireplace & Spa
FireplaceJetted Bath Tub
Windows, Doors, Floors & Walls
Double Paned Windows
Security
Security System

Exterior Features

Exterior Home Features
Roof: Shake ShingleExterior: WoodGardenLawnPorch
Parking & Garage
GarageParking Spaces: 2Parking: Garage Attached

Property Information

Year Built
Year Built: 1941
Property Type / Style
Property Type: Single Family Home

Community

Units in Building: 1

Lot Information

Lot Area: 8974 sqft

Price and Tax history

DateEventPrice
Feb 28, 1994
Source: N/A
Sold
$189,000

Market trends in Mount Prospect

Last updated August 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$434K
$20.17KMoM
Sale-to-List Price
100.5%
Price per sq ft
$277
$9MoM
Available listings
127
3MoM

Around this home

What Locals Say about Mount Prospect

At least 376 Trulia users voted on each feature.

  • 84 % Say it's dog friendly

  • 84 % Say car is needed

  • 83 % Say there are sidewalks

  • 81 % Say parking is easy

  • 73 % Say there's holiday spirit

  • 70 % Say kids play outside

  • 69 % Say people would walk alone at night

  • 67 % Say yards are well-kept

  • 66 % Say it's walkable to restaurants

  • 65 % Say it's quiet

  • 58 % Say streets are well-lit

  • 56 % Say they plan to stay for at least 5 years

  • 54 % Say it's walkable to grocery stores

  • 52 % Say there's wildlife

  • 52 % Say neighbors are friendly

  • 42 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • Zulennyb
    "Everyone walks their dogs with the leash on. In general, the dogs look calm and trained. I have been seeing the dog owners pick up the dogs poop."
    0
    Flag
  • Dc
    "This neighborhood is clean, safe and friendly. It has a beautiful public park that has been built and its open for everyone."
    0
    Flag
  • Life4u
    "Great place to live and raise family. Excellent schools and community. Hoping to raise our children here."
    0
    Flag
  • Myrvetehoxhaj
    "It is safe for kids, and around area are good playgrounds that your little one can make easily friends. "
    0
    Flag
  • Mohsin Mohammad
    "Well known very inclusive local flew markets events and many other amenities all big grocery stores are close by and easy access. "
    0
    Flag
  • Jillian
    "Commuter suburbs that also has everything you need. Plus friendly people. Good for families as the schools are rated well. "
    0
    Flag
  • Bledar
    "Love this area quite clean and school is good everything is close by my home "
    0
    Flag
  • Vicky Drebos
    "Excellent neighborhood. Great schools. Friendly neighborhoods. Easy to get to major highways and trains. Close to mall."
    0
    Flag
  • Zulennyb
    "My commute is comfortable because I have everything very close like restaurants, shopping centers, banks, parks and more."
    0
    Flag
  • Azeez Yusuf
    "Good environment is the major reason that the neighbors consider before moving to another location. My obey the neighbor requirement policy and every "
    0
    Flag
  • Jocelynn C.
    "there a lot of parks and open fields , to walk your dog . It’s overall a great place to live it’s very clean and quite ."
    2
    Flag
  • L.royal
    "Within walking distance of my home we have schools, parks, grocery shopping, and a train station. Power lines are buried on my block so we have very few issues with power."
    1
    Flag
  • L.royal
    "I am a dog owner and we have great parks within walking distance and even restaurants that allow the dogs to join when dining alfresco. They even will bring a water bowl for the pooch. We often plan our routes around locations to drop off mail in mailboxes and garbage cans for the poop. It’s a must to pick up after your pooch and keep them on a leash. Most homes in the area have good size to allow your dog to run around outside at home too. Biggest thing to watch out for are skunks and coyotes. Small dogs have even been known to disappear under the talons of a red tail hawk in the area. Our dog is black so our hot summers can be rough, we have learned to plan the longer walks for early mornings and later evenings. Is this 100 words yet. I am running out of things to say about dogs in the area."
    0
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  • Edgar M.
    "very friendly neighbourhood with lots to offer and many places to visit. lots to offer and very safe as well."
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    Flag
  • Lisa R
    "Mount Prospect is an amazing place to live. The schools are great. Our children have so many opportunities to try sports and music through our schools and park district. We can walk to shopping, restaurants, and the train. If looking to buy, walk the prospective neighborhood and strike up a conversation. We were sold on the neighborhood after we talked to our future neighbors."
    1
    Flag
  • Edgar M.
    "Neighborhood is very clean, very peaceful, and and very friendly area. People are very respectful and kind."
    0
    Flag
  • Kishan P.
    "I own a car. Buses takes lots of time for commute. So to make easy your transportation if you have a car in this neighborhood will make your day easy"
    2
    Flag
  • Abczsipe
    "you see people their dogs more then ever. We have all shapes and sizes. planty of space. people are great about cleaning up after their furry friends. no negative dog issues."
    2
    Flag
  • Mattyiq
    "best suburb. close to everything especially highways and airport. I can travel locally or internationally. Also the school district is amazing."
    0
    Flag
  • Abczsipe
    "love the fact young old. parks great schools very good sized houses. people take very goid care of yards. planty yard space. freidly neighborhood. kids riding bike. ect.."
    0
    Flag
  • Finley C.
    "Good sense of community and plenty of family activities with the park district and Library. The Library is fantastic and has a lovely children's section."
    0
    Flag
  • Pjfrayn
    "Family hometown feeling. A wonderful library, parks and schools. Well lighted and maintained Metra station."
    0
    Flag
  • Gerry M.
    "It’s a safe place to live and I couldn’t ask for a better place to live. I can take a walk at any time"
    0
    Flag
  • Ken F.
    "Lots of dogs, friendly neighbors who are dog friendly even if they don’t have a dog themselves, great place for dogs"
    0
    Flag
  • Dianferc7
    "good neighbors, safe and friendly. great location close to everything.. good schools in the area, restaurants and easy for shopping "
    0
    Flag
  • Hassna M.
    "Lovely neighborhood, nice neighbors and very helpful also great schools, every thing is almost around you- shopping, Entertainment, hospital. "
    0
    Flag
  • Ken F.
    "Reasonable driving to suburban office & quick and easy if taking metro downtown office, metro is very convenient "
    0
    Flag
  • Cathy P
    "Downtown block party and seasonal events, concerts, Friday’s on the Green in summer, concerts at the memorial bandshell, parades on 4 July and local carnival w/fireworks, terrific pools, recreation/fitness center, classes for all ages in a myriad of topic areas, great library, cute boutique shops/restaurants in downtown Mt. Prospect. Lots of options, but not overwhelming. "
    1
    Flag
  • Aumamimi
    "Easy access to several metra trains stations from walking distance to 10 min drive. Easy access to major highways and easy easy drive to ORD. Early flights (pre rush hour - 20 min) best location. "
    2
    Flag
  • Janicekessel
    "This area is unreal. I love the shopping, restaurants and outstanding park . Walking paths at Melis Park and Arlington lakes, rock. Best place to live in my book!"
    0
    Flag
  • bob c
    "Close to trains. Great school districts. Close to shopping etc. nice neighborhood with well maintained homes."
    1
    Flag
  • Stormyjl
    "Everything is close and convenient. I have grocery stores,restaurants,schools,parks, and gas stations within walking distance."
    0
    Flag
  • famendez73
    "Our neighborhood is unique because it has great schools, a strong heartwarming and welcoming community, cool outdoor mall and a small but awesome downtown area."
    1
    Flag
  • Daniel C.
    "Mount Prospect is a nice place to raise and family. It lies in Cook County so it is on the expensive side of housing costs. overall. I recommend Mount Prospect. "
    1
    Flag
  • Dave R. S.
    "it's safe, very convenient (restaurants,grocery stores,highways) and has great town library. I would recommend if your looking for a quite small suburban place to live. "
    1
    Flag
  • Janinepschoen
    "We just moved in a week ago and absolutely love the neighborhood, the people and the entire town of Mount Prospect. This is definitely out forever neighborhood. "
    1
    Flag

LGBTQ Local Legal Protections

Frequently asked questions about 21 S William St

  • What is 21 S William St estimated to be worth?
    Trulia's estimated value for 21 S William St in Mount Prospect, IL is $472,400.
  • What is the price history for 21 S William St?
    21 S William St in Mount Prospect, IL last sold for $189,000 in February 1994.
  • Is Mount Prospect a buyer's or seller's market?
    Mount Prospect is currently a seller's market, based on recent for-sale activity.
  • What's the median sale price in Mount Prospect?
    The median sale price in Mount Prospect is $434K. That is up $20.17K from the prior month.
  • Does 21 S William St have air conditioning?
    Yes, 21 S William St in Mount Prospect, IL has air conditioning.
  • Does 21 S William St have laundry facilities?
    Yes, 21 S William St in Mount Prospect, IL has in-unit laundry.

Explore by feature - Pet Friendly

19 pet-friendly rentals in Mount Prospect, IL

Explore by feature - Garage

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Explore by feature - Air Conditioning

42 rentals with air conditioning in Mount Prospect, IL

Explore by feature - Pool

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Explore by feature - Washer/dryer

36 rentals with a washer/dryer in Mount Prospect, IL

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Off Market Homes Near 21 S William St

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