We are in the beginning stages of building a new b occupancy medical office building with 2 stories, also a basement. Each floor including the basement is 2475 square feet, totaling 7,425 square feet. Measurement of each floor is 45x55 square feet. The basement is unfinished, concrete walls. The other 2 floors are wood framed. Do we require a sprinkler system in this building? If so, would there be any exceptions like exterior stairwells?