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Unit-level data for residential condominiums in Cook County, collected by the Assessor's Office from 1999 to present. The dataset includes characteristics like unit square footage, number of bedrooms, and bathrooms, but these detailed features are only available on a per-triad basis after 2021. It is used primarily for property valuation, assessments, and reporting.
Parcel Index Numbers (`pin`) must be zero-padded to 14 digits, as leading zeros may be lost in downloads. The dataset includes non-residential units like parking and common areas, which are not valued using mass appraisal and may affect aggregation of ownership percentages.
| # | Column Name |
|---|---|
| 1 | year_built |
| 2 | row_id |
| 3 | is_common_area |
| 4 | bldg_is_mixed_use |
| 5 | num_half_baths |
| 6 | num_full_baths |
| 7 | num_bedrooms |
| 8 | unit_sf |
| 9 | pin_proration_rate |
| 10 | township_code |
| 11 | land_sqft |
| 12 | building_pins |
| 13 | building_sqft |
| 14 | proration_key_pin |
| 15 | card_num |
| 16 | pin10 |
| 17 | pin |
| 18 | cdu |
| 19 | building_non_units |
| 20 | card_proration_rate |
| 21 | tax_year |
| 22 | is_parking_space |
| 23 | pin_num_landlines |
| 24 | pin_is_multiland |
| 25 | class |