The word "store" as used herein is not intended and
shall not be construed to include or permit establishments handling
or storing coal, oil, lumber, sand, gravel, stone, brick, terra-cotta,
masonry materials, building materials, steel, scrap metal, scrap paper,
rags or bulk structural materials or general storage warehouse within
a B-2 Business District. However, the storage of materials in connection
with the activities of a contractor or similar tradesman may be permitted
in the B-2 Business District if such materials are of the finish-type
and completely stored inside the building.