Any story, any portion of the finished ceiling of
which is below the average finished exterior grade around the perimeter
of the building, shall be designated as "cellar area" and may be used
for utility purposes only, such as the location of motors, heating
equipment, cooling equipment and any and all other mechanical devices
necessary for the operation of the building; for dead storage of merchandise
inventory, supplies, files, records and the like; for parking of tenants'
automobiles; but may not be used as an area in which persons may live,
sleep, work or congregate; nor may such area be used for restaurant,
commissary, kitchen, recreation or entertainment purposes.