Personal interest of commissioners or employees in projects or property prohibited

No commissioner or employee of an authority shall acquire any interest, direct or indirect, in any project or in any property included or planned to be included in any project, nor shall he have any interest, direct or indirect, in any contract or proposed contract for materials or services to be furnished or used in connection with any project. If any member or employee of any authority owns or controls an interest, direct or indirect, in any property included in any project, which was acquired prior to his appointment or employment, he shall disclose such interest in writing to the authority and such disclosure shall be entered upon the minutes of the authority.