Alterations and Additions. Alterations, as applied to a nonconforming building or structure, shall include only a change or rearrangement of interior partitions, the structural supports or a change in exterior appearance.
A nonconforming building or structure may be altered, provided that the cost of alterations does not exceed, in the aggregate, 50% of the assessed value of the structures. More substantial alterations are not permitted without Board approval.
The physical expansion of a structure or the intensification of a use associated with a nonconforming building or structure is considered an addition. Furthermore, these types of additions to nonconforming buildings and structures are not permitted except as provided in subsection 22-7.3f,2.