The owner of an abandoned sign or the real property where the sign is located shall remove said sign within 30 days after receipt of written notification, if there is no further intended use of the sign and its structural portions. However, the owner of a sign, the purpose of which has been abandoned, who desires to make subsequent use of the structural portions of such sign in its present location, may, within 30 days after receipt of written notification, make an application to the Director for an extension of time. Where the owner submits reasonable evidence that he/she is endeavoring to secure a use for the sign (i.e., a new tenant, arrival of new product line, etc.), the Director may grant extensions of time. The Director may require, as a condition of granting such extension, to paint out, obscure, or remove some or all elements of the message or face portion, or structural members of the sign in such a manner as to leave the remaining structure neat and unobtrusive in appearance and in harmony with the structure to which it is attached, and may require that such work be done within a specified time period after the granting of such extension, or the extension shall be invalidated by such failure.