Nope, that map shows the whole of both buildings in use, as they indeed were. What may appear as empty space were either circulation areas (remember the open plan design) or outside of the exterior walls. I've (badly on an iPad) drawn the outline of the buildings as they were on the attached file.
It does have one error; the teachers centre was also inside the forth rotunda (which was built especially for it in 1989) and which has since been demolished. The outreach bookstore was also in here on the upper floor.
The upper level teachers center moved for Innoventions; upstairs in the 1994 new build on the north end of Innoventions West. The space is now above Art of Disney.
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