601 S William St, Mount Prospect, IL 60056 Property Records

Cook County property record for 601 S William St, Mount Prospect, IL 60056

Property Summary

Property Type	Single Family Home
Details	3 bd · 1.5 ba · 1,259 sqft · built 1956
Lot Size	0.229 acres (9,971 sqft)
Owner	2 Individual Names on Record
Last Sale	$500,000 (Jun 2025)
Tax Bill	$8,087 (2023)
Deeds & Mortgages	Mar 2018 Line of Credit Apr 2017 Line of Credit + 1 more
Flood Zone	Zone X (minimal risk)
APN	`08-12-411-023`

Property Details

APN / Parcel Number

Primary APN	`08-12-411-023`
Alternative APN	`08-12-411-023-0000`

Interior

Bedrooms	3 Beds
Full Baths	1.5 Baths
Half Baths	1 Half Bath
Total Rooms	7 Rooms
Building Area	1,259 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1956
Effective Year Built	Effective 1957
Architectural Style	Split Level
Exterior Material	Brick/Stone
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	9,971 sqft (0.229 acres)
Garage Type	Attached
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	Central
Heating System	HVAC

Location & Zoning

Street Address	601 S WILLIAM ST
City	MOUNT PROSPECT
State	IL
Zip	60056-3956
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Range	11E
Legal Township	41N
Legal Section	12
Legal Subdivision	PLEASANT HEIGHTS MOUNT PROSPECT
Legal Block	6
Legal Lot Number	21,22
Jurisdiction	COOK IL
Township / Civil Division	ELK GROVE
Census Block Group	3
Census Block	3010
Census Tract	804901

Owner

Source: Cook County records, as of May 27, 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	2 Individual Names on Record
Mailing Address	601 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Tenants by the Entirety

Deeds, Mortgages & Sale History

Date	Document
Mar 6, 2018	Deed of Trust, Mortgage · Line of Credit GLENVIEW ST BK
Apr 24, 2017	Deed of Trust, Mortgage · Line of Credit GLENVIEW ST BK
Mar 24, 2017	Grant Deed, Transfer CHICAGO TITLE COMPANY, CHICAGO TITLE LAND TRUST CO

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Jun 25, 2025 · Amount on Record
Deed Sale	Jun 25, 2025 · Amount on Record
Prior Sale	Sep 7, 2011 · Amount on Record
Deed Document Number	202519079
Prior Transfer Date	Sep 21, 2011
Prior Transfer Doc	0000049096
Record Updated	Oct 29, 2026

March 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	COOK IL
Property Address	601 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956
Document Number	1807446203
Instrument Date	Mar 6, 2018
Transaction Type	Mortgage
Record Updated	Mar 27, 2018
Title Company	CHICAGO TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	601 S WILLIAM ST MOUNT PROSPECT IL 600563956, MOUNT PROSPECT, IL 60056-3956

Mortgage

Document Number	1807446203
Date	Mar 15, 2018
Instrument	7446203

Lender

Name	GLENVIEW ST BK
Type	Bank
Address	GLENVIEW, IL 60025

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	60 Months
Due	Mar 14, 2023

Interest

Rate Type	Adjustable Rate

April 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	COOK IL
Property Address	601 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956
Document Number	1715249111
Instrument Date	Apr 24, 2017
Transaction Type	Mortgage
Record Updated	Jun 8, 2017
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	601 S WILLIAM ST MOUNT PROSPECT IL 600563956, MOUNT PROSPECT, IL 60056-3956

Mortgage

Document Number	1715249111
Date	Jun 1, 2017
Instrument	15249111

Lender

Name	GLENVIEW ST BK
Type	Bank
Address	GLENVIEW, IL 60025

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	60 Months
Due	May 31, 2022

Interest

Rate Type	Adjustable Rate

March 2017: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	COOK IL
Recording Date	Mar 24, 2017
Property Address	601 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956
Document Number	1708355057
Instrument Date	Mar 20, 2017
Instrument	8355057
Transaction Type	Transfer
Record Updated	Apr 4, 2017
Title Company	CHICAGO TITLE COMPANY, CHICAGO TITLE LAND TRUST CO

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	601 S WILLIAM ST MOUNT PROSPECT IL 600563956, MOUNT PROSPECT, IL 60056-3956

Tax Assessment & Valuation

Source: Cook County assessment roll, as of May 27, 2026

Property Jurisdictions

Type	Name
State	Illinois
County	Cook County
County Subdivision	Elk Grove Township
Municipality	Mount Prospect Village
Secondary School District	Township High School District 214 (09 - 12)
Elementary School District	Mount Prospect School District 57 (PK - 08)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2025		$41,000 (+17.14%) Land $11,965 Building $29,035	$410,000 (+17.14%) Land $119,650 Building $290,350
2023	$8,087.00 (+53.1%)
2022	$5,282.00 Homeowner's exemption Senior Citizen's exemption	$35,000 Land $9,971 Building $25,029	$350,000 Land $99,710 Building $250,290

Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

Flood

Source: FEMA National Flood Hazard Layer, effective February 11, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	2 in force
Nearby Flood Claims	6 (1987–2007)
Claims Outside the SFHA	2 of 6
Most Recent Claim	Aug 2007 · Severe Storms And Flooding
Claims by Event	Severe Storms & Flooding, Aug 1987 · 3 claims

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Not rated no burnable land within ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	MOUNT PROSPECT serves 41,000 people · EPA ID IL0311980
Water Source	Purchased surface water from NORTHWEST SUBURBAN MUNICIPAL JAWA
Last State Inspection	Aug 2025
Lead	2 ppb (2026–2028) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	11 last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes. The service area is an EPA estimate; the actual supplier may differ.

Internet Providers

Source: FCC Broadband Data Collection, based on 671 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Astound Broadband Cable	1,500 / 50
Verizon Fixed Wireless	1,000 / 75

May also be available: T-Mobile.

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