Cook County property record for 11 S William St, Mount Prospect, IL 60056
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 1,672 sqft · built 1929 |
| Lot Size | 0.175 acres (7,600 sqft) |
| Owner | Individual Name on File |
| Last Sale | $285,000 (Jul 2009) |
| Tax Bill | $9,383 (2023) |
| Deeds & Mortgages | Jan 2021 Mortgage Nov 2018 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 08-12-202-006 |
| Primary APN | 08-12-202-006 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,672 sqft Living Area |
| 1st Floor Area | 1,672 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1929 |
|---|---|
| Effective Year Built | Effective 1930 |
| Architectural Style | Bungalow |
| Exterior Material | Brick/Stone |
| Construction Type | Frame |
| Roof Material | Asphalt |
| Lot Area | 7,600 sqft (0.175 acres) |
| Garage Type | Detached |
| Cooling System | Central |
|---|---|
| Heating System | Hot Water |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 11 S WILLIAM ST |
|---|---|
| City | MOUNT PROSPECT |
| State | IL |
| Zip | 60056-3320 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Range | 11E |
| Legal Township | 41N |
| Legal Section | 12 |
| Legal Subdivision | BUSSES ESTN ADD/MT PROSPECT |
| Legal Block | 5 |
| Legal Lot Number | 17 |
| Jurisdiction | COOK IL |
| Township / Civil Division | ELK GROVE |
| Census Block Group | 1 |
| Census Block | 1005 |
| Census Tract | 804901 |
11 S William St is owned and occupied by an individual who acquired it in November 2018.
Source: Cook County records, as of May 27, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 11 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3320 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Tenants by the Entirety |
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 |
|---|---|
| Jan 26, 2021 | Deed of Trust, Mortgage · Conventional Mortgage UNITED WHOLESALE MORTGAGE |
| Nov 7, 2018 | Quit Claim Deed, Mortgage US BK |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Jul 8, 2009 · Amount on File |
| Deed Sale | Jul 8, 2009 · Amount on File |
| Deed Document Number | 200940019 |
| Last Transfer Date | Nov 1, 2018 |
| Transfer Doc | 0000049092 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 11 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3320 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Name | Verified Name |
|---|
| Document Number | 0002628123 |
|---|---|
| Date | Jan 26, 2021 |
| Instrument | 2102628123 |
| Name | UNITED WHOLESALE MORTGAGE |
|---|---|
| Type | Mortgage Company |
| Address | PONTIAC, MI 48341 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 239 Months |
| Due | Dec 1, 2040 |
| Rate Type | Fixed Rate |
|---|
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | COOK IL |
| Recording Date | Nov 7, 2018 |
| Property Address | 11 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3320 |
| Document Number | 1831149092 |
| Instrument Date | Nov 1, 2018 |
| Instrument | 31149092 |
| Transaction Type | Mortgage |
| Record Updated | Nov 16, 2018 |
| Title Company | FIDELITY NATIONAL TITLE |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Tenants by the Entirety |
| Address | 11 S WILLIAM ST MOUNT PROSPECT IL 600563320, MOUNT PROSPECT, IL 60056-3320 |
| Document Number | 1831149093 |
|---|---|
| Date | Nov 7, 2018 |
| Instrument | 31149093 |
| Name | US BK |
|---|---|
| Type | Bank |
| Address | OWENSBORO, KY 42301 |
| Amount | Amount on Record |
|---|---|
| Term | 360 Months |
| Due | Nov 6, 2048 |
| Rate | 4.5% |
|---|
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 | $45,000 Land $8,740 Building $36,260 | $450,000 Land $87,400 Building $362,600 | |
| 2023 | $9,383.00 (+4.34%) | ||
| 2022 | $8,993.00 Homeowner's exemption | $37,000 Land $7,220 Building $29,780 | $370,000 Land $72,200 Building $297,800 |
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 11 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 11 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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