(a) means the entire floor area of a building that is separated from other portions of the building and is accessible by the same entrance or entrances and is occupied by a specific use;
(b) for greater certainty, (a) must be interpreted to mean that whenever a person inside of a building must exit the building or enter a common internal corridor to access a different portion of the building, those two portions of the building are separate; and
(c) the measurement of use area includes the floor area of:
(i) all mezzanines and storeys capable of being accessed by the same entrance without leaving the building or using a common internal corridor,
(ii) all mechanical rooms, offices and other spaces that support the use and can be accessed without leaving the building or using a common internal corridor; and
(iii) all spaces within a building capable of being accessed by the same entrance without leaving the building or using a common internal corridor regardless of whether the space is open to the public including washroom facilities, storage rooms, employee-only areas, and similar spaces.
(d) does not apply to Dwelling Units.