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27 May 1972 *Tentative architectural drawings approved by General Services Administration. July 1972 National Capital Planning Commission final approval. July 1972 Intermediate architectural working drawings approved by General Services Administration. July 1972 Beginning of invitations to bid: Excavation Advertise July 1, 1972 Award contract Aug. 17, 1972 Structural Steel Advertise July 28, 1972 Award contract Sept. 28, 1972 Marble and Supporting System Advertise July 14, 1972 Award contract Sept. 14, 1972 Footing and Foundation Advertise Sept. 8, 1972 Award contract Nov. 8, 1972 September 1972 Design completion Wrap-up packages, i.e., landscaping, special finishes, all contracts awarded by early 1973. July 1975 Construction completion. July 1976 Building opened to the public. _________ *Indicates completed action.