The grid created the space between and within the two to three story buildings and incorporated Mies’ concept of “universal space.” His ideas on this included the expression of structure, exterior walls used as skin, and the overlapping placement of buildings to allow space to flow. The design challenge for Mies arose with programs that did not fit within the activities with which he structured the grid around, for example, the auditorium and stairs. In Mies’ first approach to this problem he separated these components outside of the main building blocks. However, he continued reworking the plan so that they became part of the building blocks. In the final rendition he used his concept of universal space to solve the problem. The auditorium became a huge column-free space, allowing these specific programs to take their own forms free from the gridded structure. In this way, building structure was also not compromised by interior functions.