Cook County property record for 507 S William St, Mount Prospect, IL 60056 · Last verified June 2026
| Property Type | Residential > Single Family > Home |
|---|---|
| Bedrooms | 3 Beds |
| Bathrooms | 1 Baths |
| Year Built | Built 1957 |
| Square Footage | 1,288 sqft Living Area |
| Lot Size | 7,236 sqft (0.166 acres) |
| Occupancy | Owner Occupied |
| Last Sale | $288,000 (2020) |
| Tax Bill | $8,269.00 (2023) |
| Primary APN | 08-12-406-004 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Baths |
| Total Rooms | 6 Rooms |
| Building Area | 1,288 sqft Living Area |
| 1st Floor | 1,288 sqft 1st Floor |
| Stories | 1 Stories |
| Year Built | Built 1956 |
|---|---|
| Effective Year Built | Effective 1957 |
| Architectural Style | Bungalow Style |
| Exterior Material | Brick/Stone (Brick and/or Stone) Exterior |
| Construction Type | Frame Construction |
| Roof Material | Asphalt Roof |
| Lot Area | 7,236 sqft (0.166 acres) |
| Parking Spaces | 1 Parking Spaces |
| Garage Type | Attached Garage |
| Cooling System | Central Cooling |
|---|---|
| Heating System | HVAC Heating |
| Street Address | 507 S WILLIAM ST |
|---|---|
| City | MOUNT PROSPECT |
| State | IL |
| Zip | 60056-3954 |
| Property Usage | Residential Property Usage |
| 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 |
| Minor Civil Division | ELK GROVE |
| Census Blockgroup | 3 |
| Census Block | 3011 |
| Census Tract | 804901 |
Source: Cook County records · APN 08-12-406-004
Assessment roll updated May 27, 2026 · Last verified June 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 File |
|---|---|
| Mailing Address | 507 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954 |
| Occupancy | Owner Occupied |
| Owner Type | Owner is an Individual, Couple or Unincorporated Entity |
| Date | Document |
|---|---|
| Aug 21, 2023 | Deed of Trust, Mortgage · Stand Alone Second Mortgage METRO FCU |
| Feb 28, 2022 | Deed of Trust, Mortgage · Conventional Mortgage GUARANTEED RATE INC |
| Feb 24, 2020 | Warranty Deed, Transfer · Conventional Mortgage with Private Mortgage Insurance (PMI) GUARANTEED RATE |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Feb 24, 2020 · Amount on Record |
| Deed Sale | Feb 24, 2020 · Amount on Record |
| Deed Doc Number | 202015249 |
| Prior Transfer Date | May 27, 2015 |
| Prior Transfer Doc | 0000029016 |
| Record Refreshed | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 507 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954 |
| Transaction Type | Mortgage |
| Record Updated | Aug 31, 2023 |
| Name | Verified Name |
|---|
| Document Number | 0023313268 |
|---|---|
| Date | Aug 21, 2023 |
| Instrument | 2323313268 |
| Name | METRO FCU |
|---|---|
| Type | Credit Union |
| Address | ARLINGTON HEIGHTS, IL 60004 |
| Type | Stand Alone Second Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 61 Months |
| Due | Aug 31, 2028 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 507 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954 |
| Transaction Type | Mortgage |
| Record Updated | Mar 23, 2022 |
| Title Company | E-CHICAGO TITLE, CHICAGO TITLE |
| Name | Verified Name |
|---|
| Document Number | 0005907005 |
|---|---|
| Date | Feb 28, 2022 |
| Instrument | 2205907005 |
| Name | GUARANTEED RATE INC |
|---|---|
| Type | Mortgage Company |
| Address | CHICAGO, IL 60613 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 358 Months |
| Due | Dec 01, 2051 |
| Rate Type | Fixed Rate |
|---|---|
| Rate | 2.99% |
| Document Type | Warranty Deed |
|---|---|
| Jurisdiction | COOK IL |
| Recording Date | Feb 24, 2020 |
| Property Address | 507 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3954 |
| Document Number | 2005515249 |
| Instrument Date | Feb 17, 2020 |
| Instrument | 5515249 |
| Transaction Type | Transfer |
| Record Updated | Mar 04, 2020 |
| Title Company | ATTORNEY ONLY |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on File |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $288.00 |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Tenant By Entirety |
| Address | 507 S WILLIAM ST MOUNT PROSPECT IL 600563954, MOUNT PROSPECT, IL 60056-3954 |
| Document Number | 2005515250 |
|---|---|
| Date | Feb 24, 2020 |
| Instrument | 5515250 |
| Name | GUARANTEED RATE |
|---|---|
| Address | CHICAGO, IL 60613 |
| Type | Conventional Mortgage with Private Mortgage Insurance (PMI) |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Feb 23, 2050 |
| Rate Type | Fixed Rate |
|---|
Source: Cook County records · Assessment roll updated May 27, 2026 · Last verified June 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) |
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.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $38,000 (+15.15%) Land $8,683 Building $29,317 | $380,000 (+15.15%) Land $86,830 Building $293,170 | |
| 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 |
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