1. These dimensions do not reference the same edge. The 1'-0 3/4" references the EOD along the holdroom low-roof, whereas the EOD of the subcore at the north low-roof corners is 5-1/2" per Detail E6/S-547. The 10-1/2" references the end of structure (i.e., the end of the L5x5) from the HSS beam centerline.2. The correct EOD dimension is 4-3/8", or 3'-0 1/2" from gridline N2, for the low-roof of both subcores. Please see markups.