(a) No commissioner or an executive or managerial employee of an authority shall acquire any interest, direct or indirect, in any housing 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 housing project. If any commissioner or employee of an authority owns or controls an interest, direct or indirect, in any property included or planned to be included in any housing project, he shall immediately disclose the same in writing to the authority and such disclosure shall be entered upon the minutes of the authority. Failure so to disclose such interest shall constitute misconduct in office. Occupancy of a dwelling unit owned by the housing authority or enrolled in a program of housing authority assistance to low-income families in private accommodations shall not be deemed an interest in any project or in a contract for materials or services or in property included in any project for the purposes of this section.

(b) No person who has served as a commissioner of an authority shall be employed by such authority for a period of two years after leaving office. The provisions of this subsection shall not apply to a commissioner who has served for more than twenty years for a housing authority which does not have an executive director.