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Cook County Assessor Building Characteristics by PIN
x402
Cook County Assessor Building Characteristics by PIN is a paid API for AI agents from api.jobsproperty-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Returns Cook County Assessor building characteristics (year built, square footage, bedrooms, land area, assessment class) for a 14-digit PIN across one or more assessment years.
Price / call$0.002
Success—
StatusUnknown
How this service works
Cook County Assessor building characteristics by 14-digit PIN (Open Data portal): year built, building and unit square feet, bedrooms, land square feet and class, per assessment year. Only what the assessor publishes; no owner data.
Output
A JSON object containing the PIN, count of years returned, and an array of annual records each with: year, bedrooms, land square footage, unit square footage, year built, total building square footage, and assessment class. Also includes the source URL from the Cook County open data catalog and a checkedAt timestamp.
Example use cases
Property due diligence before purchase
“I'm looking at a Cook County property with PIN 05292000170000 — can you get me the assessor's records showing the year built, building square footage, and assessment class for the past 5 years so I can verify what the seller told me?”
Verify square footage for appraisal
“My appraisal report says the building at PIN 20324100100000 in Cook County is 2,400 square feet, but I want to double-check that against the county assessor's data — can you look it up?”
Track assessment class changes over time
“Can you fetch the Cook County Assessor records for PIN 17094260260000 for the last 10 years so I can see if the assessment class or building characteristics have changed?”
Technical details
Endpoint
GEThttps://api.jobsproperty-api.workers.dev/api/realestate/cookcountyassessor?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need Cook County Assessor building characteristics (year built, square footage, bedrooms, land area, assessment class) tied to a 14-digit PIN, especially when you want multi-year assessment history from official government open data. Prefer this over general real estate APIs when the PIN is known and the use case is assessment or property verification rather than owner, sale, or market data.
Side effects
- Invalid or malformed PIN (not 14 digits) returns an error
- PIN not found in assessor database returns empty results
- Limit parameter outside 1–20 range may be rejected or clamped
- Cook County open data portal downtime causes upstream failure
- Transient Cloudflare Worker errors may return 5xx responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"pin": "01011010301010",
"count": 3,
"years": [
{
"year": 2026,
"bedrooms": 0,
"landSqft": 23248,
"unitSqft": 175,
"yearBuilt": 2006,
"buildingSqft": 54938,
"assessmentClass": "299"
},
{
"year": 2025,
"bedrooms": 0,
"landSqft": 23248,
"unitSqft": 175,
"yearBuilt": 2006,
"buildingSqft": 54938,
"assessmentClass": "299"
}
],
"source": "https://datacatalog.cookcountyil.gov/resource/3r7i-mrz4.json",
"checkedAt": "2026-10-23T09:36:59.752Z"
}
}Tags
x402
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