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Parcel sales for real property in Cook County, Illinois, from 1999 onward. The Cook County Assessor's Office uses this data to model fair market values for unsold properties. Sales are updated monthly but reported on a lag, with records populating months after their official recording date.
Parcel Index Numbers (PINs) must be zero-padded to 14 digits, as leading zeros may be lost in some downloads. Users must apply custom filters (e.g., sale_filter_same_sale_within_365) to recreate historical filtering schemas.