Except as expressly authorized in this chapter or in the condominium instruments or as otherwise provided by law, no unit owners’ association shall require the use of any for sale sign that is (i) a unit owners’ association sign or (ii) a real estate sign that does not comply with the requirements of the Real Estate Board. A unit owners’ association may, however, prohibit the placement of signs in the common elements and establish reasonable rules and regulations that regulate (a) the number of real estate signs to be located on real property upon which the owner has a separate ownership interest or a right of exclusive possession, so long as at least one real estate sign is permitted; (b) the geographical location of real estate signs on real property in which the owner has a separate ownership interest or a right of exclusive possession, so long as the location of the real estate signs complies with the requirements of the Real Estate Board; (c) the manner in which real estate signs are affixed to real property; and (d) the period of time after settlement when the real estate signs on such real property shall be removed.