# Cook County Assessor Building Characteristics by PIN

> 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.

## Facts

- Endpoint: GET https://api.jobsproperty-api.workers.dev/api/realestate/cookcountyassessor?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cook-county-assessor-building-characteristics-by-pin-879c694c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xdhBDw7BuLri92EBqx82b

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability cook-county-assessor-building-characteristics-by-pin-879c694c
```

Example prompt: Can you pull the Cook County Assessor building details for PIN 14081010390000 — I want to see the year built, total building square footage, and assessment class for the last 3 years.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "pin"
     ],
     "properties": {
      "pin": {
       "type": "string",
       "description": "14-digit Cook County PIN, digits only (dashes allowed)"
      },
      "limit": {
       "type": "string",
       "description": "How many years, 1 to 20 (default 5)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cook-county-assessor-building-characteristics-by-pin-879c694c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.jobsproperty-api.workers.dev](https://www.zero.xyz/host/api.jobsproperty-api.workers.dev/llms.txt)