The commission may, in securing any such bids, or in selling, exchanging or conveying any such property, specify conditions to be placed in the commission’s instrument of conveyance of such property, and thereafter place such condition in such instrument, as covenants running with the land. Any violation of such covenants may result in a right by the port commission to cancel said conveyance and retake said property free and clear of any claim of the purchaser, when such instrument so provides.