Maximum floor area ratio: 0.176, except that this maximum ratio may be increased to 0.226 where a hotel is contemplated by the development plan. In no event shall the floor area ratio exceed 0.176 where the development of the tract does not include a hotel, except for the following provision. Either floor area ratio maximum may be increased by 0.005 for each increase of 1.0% in open space above 55%, provided that in no event shall the floor area ratio exceed 0.226 where the development of the tract does not include a hotel, nor shall the floor area ratio exceed 0.274 where a hotel is contemplated by the development plan. For purposes of this section, the "floor area ratio" shall mean the gross floor area of all structures, not including parking garages and canopies, divided by the total area of the tract.