No more
than one temporary sign advertising an open house for the sale of
property, which is no larger than 24 inches by 12 inches in size,
shall be permitted. The sign may only be erected and displayed on
the premises where the open house is conducted and must contain the
name and telephone number of the realty company conducting the open
house. The open-house sign can only be erected the day of the open
house and must be removed within 24 hours of its erection.