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

Cook County property record for 605 S William St, Mount Prospect, IL 60056

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 2,057 sqft · built 1956
Lot Size0.209 acres (9,112 sqft)
Owner2 Company Names on Record
Last Sale$417,500 (Oct 2013)
Tax Bill$13,371 (2023)
Deeds & MortgagesDec 2025 Transfer
May 2017 Line of Credit
Flood ZoneZone X (minimal risk)
APN08-12-411-025

Property Details

APN / Parcel Number

Primary APN08-12-411-025
Alternative APN
  • 08-12-411-025-0000

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms10 Rooms
Stories2 Stories
Building Area2,057 sqft Living Area
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1956
Effective Year BuiltEffective 1957
Architectural StyleMulti-Level
Exterior MaterialBrick/Stone
Construction TypeFrame
Roof MaterialAsphalt
Lot Area9,112 sqft (0.209 acres)
Garage TypeAttached
Parking Spaces1 Parking Space

Utilities, Heating & Cooling

Cooling SystemCentral
Heating SystemHVAC
Water SourceCommercial

Location & Zoning

Street Address605 S WILLIAM ST
CityMOUNT PROSPECT
StateIL
Zip60056-3956
Property CategoryResidential
Property TypeResidential > 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 Range11E
Legal Township41N
Legal Section12
Legal SubdivisionPLEASANT HEIGHTS ADD TO MOUNT PROSPECT
Legal Block6,6
Legal Lot Number3,4,S
JurisdictionCOOK IL
Township / Civil DivisionELK GROVE
Census Block Group3
Census Block3010
Census Tract804901

Owner

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

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record2 Company Names on Record
Mailing Address605 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956
OccupancyOwner Occupied
Owner TypeCompany
VestingTrust

Deeds, Mortgages & Sale History

DateDocument
Dec 11, 2025Intrafamily Transfer, Transfer
ATTORNEY ONLY, ATTORNEY
May 12, 2017Deed of Trust, Mortgage · Line of Credit
JP MORGAN CHASE BK

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleOct 31, 2013 · Amount on Record
Deed SaleOct 31, 2013 · Amount on Record
Prior SaleJun 2, 2008 · Amount on Record
Deed Document Number201341037
Last Transfer DateNov 10, 2025
Transfer Doc0000024183
Record UpdatedOct 29, 2026

December 2025: Intrafamily Transfer, Transfer

Document TypeIntrafamily Transfer
JurisdictionCOOK IL
Recording DateDec 11, 2025
Property Address605 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956
Document Number0034524183
Instrument DateNov 10, 2025
Instrument2534524183
Transaction TypeTransfer
Record UpdatedDec 24, 2025
Title CompanyATTORNEY ONLY, ATTORNEY

Transaction

Tax$0.00
Amount AccuracyTransfer Tax Exempt
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address605 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956

May 2017: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionCOOK IL
Property Address605 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3956
Document Number1714615028
Instrument DateMay 12, 2017
Transaction TypeMortgage
Record UpdatedJun 7, 2017

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipTenants by the Entirety
Address605 S WILLIAM ST MOUNT PROSPECT IL 600563956, MOUNT PROSPECT, IL 60056-3956

Mortgage

Document Number1714615028
DateMay 26, 2017
Instrument14615028
Lender
NameJP MORGAN CHASE BK
TypeBank
AddressCOLUMBUS, OH 43240
Agreement
TypeLine of Credit
AmountAmount Recorded
Term420 Months
DueMay 25, 2052
Interest
Rate TypeAdjustable Rate
Rate4%

Tax Assessment & Valuation

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

Property Jurisdictions

TypeName
StateIllinois
CountyCook County
County SubdivisionElk Grove Township
MunicipalityMount Prospect Village
Secondary School DistrictTownship High School District 214 (09 - 12)
Elementary School DistrictMount Prospect School District 57 (PK - 08)

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2025$53,000 (+10.42%) Land $10,934 Building $42,066$530,000 (+10.42%) Land $109,340 Building $420,660
2023$13,371.00 (+4.01%)$48,000 (-) Land $9,112 Building $38,888$480,000 (-) Land $91,120 Building $388,880
2022$12,856.00$48,000 Land $9,112 Building $38,888$480,000 Land $91,120 Building $388,880

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 ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Community Rating SystemClass 6 (20% premium discount)
Nearby Flood Policies2 in force
Nearby Flood Claims6 (1987–2007)
Claims Outside the SFHA2 of 6
Most Recent ClaimAug 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 RiskNot 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 SystemMOUNT PROSPECT
serves 41,000 people · EPA ID IL0311980
Water SourcePurchased surface water from NORTHWEST SUBURBAN MUNICIPAL JAWA
Last State InspectionAug 2025
Lead2 ppb (2026–2028)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and Reporting11
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

ProviderMax 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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