Cook County property record for 101 S William St, Mount Prospect, IL 60056
| Property Type | Apartments (5+ Units) |
|---|---|
| Details | 6 bd · 2.5 ba · 2,650 sqft · built 1928 |
| Lot Size | 0.175 acres (7,600 sqft) |
| Owner | Individual on Record |
| Last Sale | $360,000 (Feb 2016) |
| Tax Bill | $11,422 (2023) |
| Deeds & Mortgages | Oct 2020 Mortgage Dec 2016 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 08-12-209-001 |
| Primary APN | 08-12-209-001 |
|---|---|
| Alternative APN |
|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 12 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 2,650 sqft Living Area |
| Year Built | Built 1928 |
|---|---|
| Effective Year Built | Effective 1928 |
| Architectural Style | Multi-Family |
| Exterior Material | Brick/Stone |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Slate |
| Lot Area | 7,600 sqft (0.175 acres) |
| Garage Type | Detached |
| Parking Spaces | 1 Parking Space |
| Cooling System | HVAC |
|---|---|
| Heating System | Hot Water |
| Street Address | 101 S WILLIAM ST |
|---|---|
| City | MOUNT PROSPECT |
| State | IL |
| Zip | 60056-3322 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Apartments (5+ Units) |
| Legal Description | (BUSSES) (EASTERN) ADD TO MOUNT (PROSPECT) SUB IN EH OF **NOTE** THIS IS A COMBINATION OF 4 SUBS SEC 12-41-11 |
| Legal Range | 11E |
| Legal Township | 41N |
| Legal Section | 12 |
| Legal Subdivision | BUSSES EASTERN ADD TO MOUNT PROSPECT |
| Legal Block | 10 |
| Legal Lot Number | 22 |
| Jurisdiction | COOK IL |
| Township / Civil Division | ELK GROVE |
| Census Block Group | 1 |
| Census Block | 1022 |
| Census Tract | 804901 |
Source: Cook County assessment roll, 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 on Record |
|---|---|
| Mailing Address | 101 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3322 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Date | Document |
|---|---|
| Oct 19, 2020 | Deed of Trust, Mortgage PROPER RATE LLC |
| Dec 22, 2016 | Deed of Trust, Mortgage · Conventional Mortgage PERL MTG |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Feb 3, 2016 · Amount on Record |
| Deed Sale | Feb 3, 2016 · Amount on Record |
| Deed Document Number | 20161079 |
| Prior Transfer Date | Mar 6, 2002 |
| Prior Transfer Doc | 0000064089 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 101 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3322 |
| Document Number | 2035712130 |
| Instrument Date | Oct 19, 2020 |
| Transaction Type | Mortgage |
| Record Updated | Jan 7, 2021 |
| Title Company | NOT AVAILABLE |
| Name | Verified Name |
|---|---|
| Relationship | Tenants by the Entirety |
| Address | 101 S WILLIAM ST MOUNT PROSPECT IL 600563322, MOUNT PROSPECT, IL 60056-3322 |
| Document Number | 2035712130 |
|---|---|
| Date | Dec 22, 2020 |
| Instrument | 35712130 |
| Name | PROPER RATE LLC |
|---|---|
| Address | CHICAGO, IL 60613 |
| Amount | Amount Recorded |
|---|---|
| Term | 360 Months |
| Due | Dec 21, 2050 |
| Rate Type | Fixed Rate |
|---|---|
| Rate | 3.37% |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 101 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3322 |
| Document Number | 1701001041 |
| Instrument Date | Dec 22, 2016 |
| Transaction Type | Mortgage |
| Record Updated | Feb 7, 2017 |
| Title Company | FIRST AMERICAN TITLE |
| Name | Verified Name |
|---|---|
| Relationship | Tenants by the Entirety |
| Address | 101 S WILLIAM ST MOUNT PROSPECT IL 600563322, MOUNT PROSPECT, IL 60056-3322 |
| Document Number | 1701001041 |
|---|---|
| Date | Jan 10, 2017 |
| Instrument | 1001041 |
| Name | PERL MTG |
|---|---|
| Type | Mortgage Company |
| Address | CHICAGO, IL 60618 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Jan 9, 2047 |
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 | $59,000 (+29.26%) Land $8,740 Building $50,260 | $590,000 (+29.26%) Land $87,400 Building $502,600 | |
| 2023 | $11,422.00 (+1%) | ||
| 2022 | $11,309.00 Homeowner's exemption | $45,645 Land $7,220 Building $38,425 | $456,450 Land $72,200 Building $384,250 |
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.
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.
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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