For business use, the occupant load factor in square feet per person is:

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Occupant load factor is the space-per-person guideline used to estimate how many people a space should accommodate. For business use, the standard approach uses gross floor area—total floor area including walls and shared spaces. With an occupant load factor of 100 square feet per person, you divide the total gross area by 100 to get the expected number of people. This reflects the density of typical office environments where circulation and non-occupiable spaces are counted in the area. Using net area would reduce space per person, increasing density, which isn’t the basis for standard business occupancy calculations in most codes. The other options correspond to either a larger space per person (200 gross) or to densities typical of other uses or when using net floor area (100 net or 9.3 net, the latter being associated with assembly seating). Therefore the correct match for business use is 100 square feet per person using gross area.