Cook County property record for 18 S William St, Mount Prospect, IL 60056
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 1,821 sqft · built 1929 |
| Lot Size | 0.175 acres (7,600 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $309,000 (Nov 2001) |
| Tax Bill | $11,890 (2023) |
| Deeds & Mortgages | Feb 2022 Mortgage Sep 2017 Line of Credit |
| Flood Zone | Zone X (minimal risk) |
| APN | 08-12-201-021 |
| Primary APN | 08-12-201-021 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 10 Rooms |
| Stories | 2 Stories |
| Building Area | 1,821 sqft Living Area |
| Year Built | Built 1929 |
|---|---|
| Effective Year Built | Effective 1930 |
| Architectural Style | Old Style |
| Exterior Material | Wood |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 7,600 sqft (0.175 acres) |
| Garage Type | Detached |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | HVAC |
| Street Address | 18 S WILLIAM ST |
|---|---|
| City | MOUNT PROSPECT |
| State | IL |
| Zip | 60056-3321 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | (SUBDIVISION) OF LT A OF BLK 6 OF BUSSE & WILLIES RES UB OF EH NW SEC 12-41-11 |
| Legal Range | 11E |
| Legal Township | 41N |
| Legal Section | 12 |
| Legal Subdivision | SUBDIVISION OF LT A OF BLK 6 OF BUSSE |
| Legal Block | 6 |
| Legal Lot Number | A |
| Jurisdiction | COOK IL |
| Township / Civil Division | ELK GROVE |
| Census Block Group | 1 |
| Census Block | 1006 |
| Census Tract | 804901 |
18 S William St is owner-occupied and held in a trust since April 2025.
Source: Cook County records, as of May 27, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 18 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3321 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Feb 9, 2022 | Deed of Trust, Mortgage · Conventional Mortgage JPMORGAN CHASE BANK NA |
| Sep 11, 2017 | Deed of Trust, Mortgage · Line of Credit JP MORGAN CHASE BK |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Nov 20, 2001 · Amount on File |
| Deed Sale | Nov 20, 2001 · Amount on File |
| Prior Sale | Nov 16, 1998 · Amount on File |
| Deed Document Number | 200192697 |
| Last Transfer Date | Apr 15, 2025 |
| Transfer Doc | 0000028002 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 18 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3321 |
| Transaction Type | Mortgage |
| Record Updated | Mar 22, 2022 |
| Title Company | CITYWIDE TITLE CORPORATION |
| Name | Verified Name |
|---|
| Document Number | 0004041021 |
|---|---|
| Date | Feb 9, 2022 |
| Instrument | 2204041021 |
| Name | JPMORGAN CHASE BANK NA |
|---|---|
| Type | Bank |
| Address | COLUMBUS, OH 43240 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 179 Months |
| Due | Jan 1, 2037 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 18 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3321 |
| Document Number | 1726515100 |
| Instrument Date | Sep 11, 2017 |
| Transaction Type | Mortgage |
| Record Updated | Aug 25, 2018 |
| Name | Verified Name |
|---|---|
| Relationship | Tenants by the Entirety |
| Address | 18 S WILLIAM ST MOUNT PROSPECT IL 600563321, MOUNT PROSPECT, IL 60056-3321 |
| Document Number | 1726515100 |
|---|---|
| Date | Sep 22, 2017 |
| Instrument | 26515100 |
| Name | JP MORGAN CHASE BK |
|---|---|
| Type | Bank |
| Address | COLUMBUS, OH 43240 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Sep 21, 2047 |
| Rate Type | Adjustable Rate |
|---|---|
| Rate | 4.25% |
Source: Cook County assessment roll, as of May 27, 2026
| 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) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $51,000 Land $8,740 Building $42,260 | $510,000 Land $87,400 Building $422,600 | |
| 2023 | $11,890.00 (+4.26%) | ||
| 2022 | $11,404.00 Homeowner's exemption | $46,000 Land $7,220 Building $38,780 | $460,000 Land $72,200 Building $387,800 |
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.
FEMA maps place 18 S William St in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 1990.
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 | 1 (1990) |
| Most Recent Claim | Aug 1990 · other causes |
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.
The area around 18 S William St has no burnable land within ember reach, so its wildfire risk is not rated.
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.
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 |
| 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.
Source: FCC Broadband Data Collection, based on 612 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable | 1,500 / 50 |
| Verizon Fixed Wireless | 1,000 / 75 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless · DSL · Fiber in parts of the area | 100 / 20 |
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