A structure of which any part has been authorized to be located
within the shoreland setback area by a variance granted before July
15, 2015, may be maintained, repaired, replaced, restored, rebuilt
or remodeled if the activity does not expand the footprint of the
authorized structure. Additionally, the structure may be vertically
expanded unless the vertical expansion would extend more than 35 feet
above grade level. Counties may allow expansion of a structure beyond
the existing footprint if the expansion is necessary to comply with
applicable state or federal requirements.