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

Cook County property record for 511 S William St, Mount Prospect, IL 60056

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 1,288 sqft · built 1956
Lot Size	0.166 acres (7,236 sqft)
Owner	Individual Name on Record
Last Sale	$171,000 (Nov 1998)
Tax Bill	$8,269 (2023)
Deeds & Mortgages	Jul 2020 Mortgage Dec 2019 Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`08-12-406-006`

Property Details

APN / Parcel Number

Primary APN	`08-12-406-006`
Alternative APN	`08-12-406-006-0000`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,288 sqft Living Area
1st Floor Area	1,288 sqft

Exterior

Year Built	Built 1956
Effective Year Built	Effective 1957
Architectural Style	Bungalow
Exterior Material	Brick/Stone
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	7,236 sqft (0.166 acres)
Garage Type	Detached
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	HVAC
Heating System	HVAC

Location & Zoning

Street Address	511 S WILLIAM ST
City	MOUNT PROSPECT
State	IL
Zip	60056-3954
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	(PLEASANT) HEIGHTS ADD TO (MOUNT)(PROSPECT) SUB OF LT S 3&4 IN OEHLERKINOIS DIVISION IN SE SEC 12-41-11
Legal Range	11E
Legal Township	41N
Legal Section	12
Legal Subdivision	PLEASANT HEIGHTS ADD TO MOUNT PROSPECT
Legal Block	3
Legal Lot Number	3,4,S
Jurisdiction	COOK IL
Township / Civil Division	ELK GROVE
Census Block Group	3
Census Block	3011
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	Individual Name on Record
Mailing Address	511 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Jul 21, 2020	Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LNS
Dec 6, 2019	Deed of Trust, Mortgage · Conventional Mortgage JP MORGAN CHASE BK
Mar 25, 2019	Deed of Trust, Mortgage · Conventional Mortgage JP MORGAN CHASE BK

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Nov 3, 1998 · Amount on Record
Deed Sale	Nov 3, 1998 · Amount on Record
Deed Document Number	199857
Prior Transfer Date	Aug 12, 1998
Prior Transfer Doc	0000000687
Record Updated	Sep 20, 2026

July 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	COOK IL
Property Address	511 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954
Document Number	2026839236
Instrument Date	Jul 21, 2020
Transaction Type	Mortgage
Record Updated	Oct 14, 2020
Title Company	OLD REPUBLIC TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Tenants by the Entirety
Address	511 S WILLIAM ST MOUNT PROSPECT IL 600563954, MOUNT PROSPECT, IL 60056-3954

Mortgage

Document Number	2026839236
Date	Sep 24, 2020
Instrument	26839236

Lender

Name	QUICKEN LNS
Type	Funding / Finance Company
Address	DETROIT, MI 48226-1906

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Sep 23, 2050

December 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	COOK IL
Property Address	511 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954
Document Number	2000606128
Instrument Date	Dec 6, 2019
Transaction Type	Mortgage
Record Updated	Jan 20, 2020
Title Company	CITYWIDE TITLE CORPORATION, CITYWIDE TITLE CORP

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Tenants by the Entirety
Address	511 S WILLIAM ST MOUNT PROSPECT IL 600563954, MOUNT PROSPECT, IL 60056-3954

Mortgage

Document Number	2000606128
Date	Jan 6, 2020
Instrument	606128

Lender

Name	JP MORGAN CHASE BK
Type	Bank
Address	COLUMBUS, OH 43240-2050

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Jan 5, 2050

March 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	COOK IL
Property Address	511 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954
Document Number	1909934051
Instrument Date	Mar 25, 2019
Transaction Type	Mortgage
Record Updated	Apr 17, 2019
Title Company	NOT AVAILABLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Tenants by the Entirety
Address	511 S WILLIAM ST MOUNT PROSPECT IL 600563954, MOUNT PROSPECT, IL 60056-3954

Mortgage

Document Number	1909934051
Date	Apr 9, 2019
Instrument	9934051

Lender

Name	JP MORGAN CHASE BK
Type	Bank
Address	COLUMBUS, OH 43240-2050

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Apr 8, 2049

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		$37,000 (+12.12%) Land $8,683 Building $28,317	$370,000 (+12.12%) Land $86,830 Building $283,170
2023	$8,269.00 (+4.38%)
2022	$7,922.00 Homeowner's exemption	$33,000 Land $7,236 Building $25,764	$330,000 Land $72,360 Building $257,640

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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