For the purposes of this subsection, "directional residential real estate open house signs" shall be defined as temporary signage placed either upon private property with the permission of the owner of that property or within the public right-of-way, in either event under the conditions hereinafter set forth and in accordance with laws, ordinances and regulations governing public rights-of-way, which said signs are limited in language to so much as may be reasonably necessary to give notice to the public of residential property that is then being offered for sale and upon which there is or will be conducted an open house for the purpose of promoting such sale; to give notice of the location and times of such open house; and to give notice of the name and address of the licensed real estate broker conducting such open house or the fact that such open house is being conducted by the owner intending to sell the premises.