The number of occupants and the space required per occupant are the key determinates to total cost of occupancy.  Consider that the occupancy costs are the multiplication of the rental rate per square foot plus the operating costs per square foot times the number of people and the space that each person occupies.  There are factors that add to the total space consumption including lost space from hallways, bathrooms, elevator cores, storage areas, atriums and reception areas.  This is often called the building loss factor and is an efficiency measure of the building.  To these losses also add the space required for cafeterias, special computer and server rooms and conference, training areas and other special spaces. More >