Cook County property record for 303 S William St, Mount Prospect, IL 60056
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,298 sqft · built 1956 |
| Lot Size | 0.175 acres (7,600 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $380,000 (May 2023) |
| Tax Bill | $6,973 (2023) |
| Deeds & Mortgages | Mar 2026 Mortgage May 2023 Transfer + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 08-12-222-002 |
| Primary APN | 08-12-222-002 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,298 sqft Living Area |
| 1st Floor Area | 1,298 sqft |
| Year Built | Built 1956 |
|---|---|
| Effective Year Built | Effective 1957 |
| Architectural Style | Bungalow |
| Exterior Material | Brick/Stone |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 7,600 sqft (0.175 acres) |
| Garage Type | Detached |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | HVAC |
|---|---|
| Heating System | HVAC |
| Street Address | 303 S WILLIAM ST |
|---|---|
| City | MOUNT PROSPECT |
| State | IL |
| Zip | 60056-3326 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | (MORNINGSIDE)(GARDENS) SUB NE SEC 12-41-11 |
| Legal Range | 11E |
| Legal Township | 41N |
| Legal Section | 12 |
| Legal Subdivision | MORNINGSIDE GARDENS |
| Legal Lot Number | 50 |
| Jurisdiction | COOK IL |
| Township / Civil Division | ELK GROVE |
| Census Block Group | 2 |
| Census Block | 2019 |
| Census Tract | 804901 |
Source: Cook County records, 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 | 2 Individual Names on Record |
|---|---|
| Mailing Address | 303 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3326 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Tenants by the Entirety |
| Date | Document |
|---|---|
| Mar 17, 2026 | Deed of Trust, Mortgage · Conventional Mortgage PENNYMAC LOAN SERVICES LLC |
| May 15, 2023 | Intrafamily Transfer, Transfer ATTORNEY ONLY, ATTORNEY |
| May 15, 2023 | Deed, Transfer · Conventional Mortgage SUCCESS LENDING LLC |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | May 15, 2023 · Amount on Record |
| Deed Sale | May 15, 2023 · Amount on Record |
| Deed Document Number | 202333133 |
| Prior Transfer Date | May 21, 1999 |
| Prior Transfer Doc | 0000000898 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | COOK IL |
| Property Address | 303 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3326 |
| Transaction Type | Mortgage |
| Record Updated | Apr 3, 2026 |
| Name | Verified Name |
|---|---|
| Address | 303 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3326 |
| Document Number | 0007625097 |
|---|---|
| Date | Mar 17, 2026 |
| Instrument | 2607625097 |
| Name | PENNYMAC LOAN SERVICES LLC |
|---|---|
| Type | Mortgage Company |
| Address | WESTLAKE VILLAGE, CA 91361 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Apr 1, 2056 |
| Rate Type | Fixed Rate |
|---|---|
| Rate | 5.99% |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | COOK IL |
| Recording Date | May 15, 2023 |
| Property Address | 303 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3326 |
| Document Number | 0013533132 |
| Instrument Date | Apr 12, 2023 |
| Instrument | 2313533132 |
| Transaction Type | Transfer |
| Record Updated | May 24, 2023 |
| Title Company | ATTORNEY ONLY, ATTORNEY |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 303 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3326 |
| Document Type | Deed |
|---|---|
| Jurisdiction | COOK IL |
| Recording Date | May 15, 2023 |
| Property Address | 303 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3326 |
| Document Number | 0013533133 |
| Instrument Date | Apr 12, 2023 |
| Instrument | 2313533133 |
| Transaction Type | Transfer |
| Record Updated | May 24, 2023 |
| Title Company | PROPER TITLE LLC |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $380.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 306 S WAVERLY PL, MT PROSPECT, IL 60056-2939 |
| Name | Verified Name |
|---|---|
| Relationship | Tenants by the Entirety |
| Address | 303 S WILLIAM ST, MOUNT PROSPECT, IL 60056-3326 |
| Document Number | 0013533134 |
|---|---|
| Date | May 15, 2023 |
| Instrument | 2313533134 |
| Name | SUCCESS LENDING LLC |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | May 1, 2053 |
| Rate Type | Fixed Rate |
|---|---|
| Rate | 6.37% |
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 | $38,000 (+22.58%) Land $8,740 Building $29,260 | $380,000 (+22.58%) Land $87,400 Building $292,600 | |
| 2023 | $6,973.00 (+4.79%) | ||
| 2022 | $6,654.00 | $31,000 Land $7,220 Building $23,780 | $310,000 Land $72,200 Building $237,800 |
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.
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 | 3 in force |
| Nearby Flood Claims | 1 (2011) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Jul 2011 · river or lake flooding |
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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