A. 
On-premises signs or other advertising devices erected before the effective date of the Historic District Act of 1959 in the Historic Districts of Nantucket and Siasconset, or before the Historic District Act of 1970 elsewhere, may continue to be maintained, unless any such sign is enlarged, reworded, redesigned, or altered in any way, including repainting in a different color. If and when the sign cannot continue to be maintained pursuant to the foregoing, immediate application must be made for a certificate of appropriateness for a new sign.
B. 
As part of the application, reuse of a freestanding sign armature with the proposed new sign may be approved, provided that:
(1) 
The armature was in use before the effective date of the Historic District Act of 1959 in the Historic Districts of Nantucket and Siasconset, or before the Historic District Act of 1970 elsewhere, or there exists a certificate of appropriateness issued by the HDC for the armature and a sign.
(2) 
An approved or preexisting sign and armature was maintained within three years of the date of application.
(3) 
The size of the new sign shall be equal to the size of the previously approved sign for that armature. Documentation of the previously approved and/or erected sign shall be submitted.
(4) 
The location of the armature has not changed.
(5) 
The proposed new sign is otherwise appropriate and approvable under the regulations set forth in this Chapter 340.
C. 
See Article III, General Regulations, for further information.