In order to achieve a productivity of 4800 sqft per hour, the building would need either a very basic clean, be low occupancy, or very open plan!
Judging by the size of the toilets, I would supect that this is not the case.
Green, you posted this same question on Feb 10th this year, I offered to help then, but nothing from you, so may I suggest you read my reply on that post, and decide if you want to any input from myself.
Regards,
Rob