[1.21gigawatts]

13 receptacles on a 20 amp circuit for commercial application

I agree with you. 120v x 20a = 2400va / 180va = 13.33 or (13) general use recepts. As Dennis had mentioned receptacles would not be considered continious and the 80% demand would not be applied. A good design would be 6 to 7 outlets on a circuit which is a safety factor should office staff want to plug in a fish tank, space heater, lava lamp and a mini fridge in the power strip.