To determine the usable area of below grade, cellar and sub-cellar areas, follow the same procedures as are appropriate for single or multiple tenant floors except that the following additional areas should be deducted from usable area: -Machine rooms and pump rooms and their enclosing walls. -Electric switchgear rooms and their enclosing walls. -Telephone equipment rooms and their enclosing walls. -All space devoted to servicing the operation of the building, i.e., cleaning contractors, storage, building maintenance shop, building engineer’s office, etc.
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