8 Ill. Adm. Code 270.105
Measuring Space
Section 270
Section 270.105 Measuring
Space
Outside space will be measured
from tie-in to tie-in, overhang to overhang, awning to awning or trailer hitch
to bumper. Stands will be measured from lot line to lot line. Storage or
service areas occupied by the lessee on either side of the main structure will
be considered as part of the main structure in determining rental charge.