Marshall R. Sanguinet and Carl G. Staats retired from practice in 1926, leaving Hedrick to continue their firm and to complete the master plan as Tech’s campus architect until 1951. Hedrick’s designs for these buildings are instructive for understanding his subsequent development of the campus. Although Watkin’s contribution cannot be discounted, he ceased to be involved with the design of new buildings after 1928. The Chemistry Building of 1929 (the last of Watkin’s designs) confirmed an emerging pattern, presenting a narrow, asymmetrical east face anchored by a corner tower toward the Administration Building, with a long, repetitive, north elevation integrated with an arcaded walkway. This formula is mirrored in Mathematical Sciences (originally the Library, 1938) directly opposite, with an identical arcaded walk. The two arcades curve inward in a Baroque configuration to frame the facade of the Science Building (1951) at the western terminus of the cross-axis, thus completing the group. Hedrick and his designers employed similar strategies to complete the Engineering group north of Memorial Circle between 1928 and 1951.