If any member of the corporate authorities of a county, or any employee or consultant of the county involved in the planning, analysis, preparation or administration of an economic development plan or an economic development project, or any proposed economic development plan or any proposed economic development project, owns or controls any interest, direct or indirect, in any property included in any economic development project area or proposed economic development project area, he or she shall disclose the same in writing to the county clerk, which disclosure shall include the dates, terms and conditions of any disposition of any such interest. The disclosures shall be acknowledged by the corporate authorities of the county and entered upon the official records and files of the corporate authorities. Any such individual holding any such interest shall refrain from any further official involvement regarding such established or proposed economic development project area, economic development plan or economic development project, and shall also refrain from voting on any matter pertaining to that project, plan or area and from communicating with any members of the corporate authorities of the county and no employee of the county shall acquire any interest, direct or indirect, in any real or personal property or rights or interest therein within an economic development project area or a proposed economic development project area after that person obtains knowledge of the project, plan or area or after the first public notice of the project, plan or area is given by the county, whichever shall first occur.