For better comfort you should go with 1.5 cfm per sq foot. Depending on how many windows and solar gain, you can increase the cfm.
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The height is not relevant. The office has a floor space of 41.5 square yards.
153.14 square feet.
The building has 4.5 milliongross square feet (418,064 gross square meters) of floor space
120ft2
13*9 = 117 square units