This 25,000 square foot addition is two stories tall with a full basement. To accommodate the use intended for the building, the basement was required to be sixteen feet deep. This depth resulted in a challenging design since the addition was adjacent to the original building that has no basement. The basement design was further complicated by a desire for low humidity which warranted special waterstopping detail. Floor designs utilize steel bar joists and beams. The structure is designed for the typical assembly loading in most areas and a reference library on the first floor.