Arizona State University (ASU), which had rented space in the area since 2010, wished to establish a permanent presence in downtown Washington, D.C. After a lengthy search for the right building in a desirable location, they purchased 1800 I Street NW, two blocks from the White House. In March 2018, following a $35 million renovation, the doors to the eight-story, 32,000-square-foot Barrett and O’Connor Center opened. Named for noteworthy female Republican Arizonans, Ambassador Barbara Barrett and former U.S. Supreme Court Justice Sandra Day O’Connor, the center is home for programs in four ASU schools, multiple think tanks, a policy journal, lobbying operations, and collaborative ventures with other organizations.
Modifications to the historic building consisted of expanding the below-grade level, adding a ninth floor, and comprehensive interior renovations. SEDC provided geotechnical engineering, construction observation and materials testing services on the project. The historic nature of the building dictated careful protection of the façade while gutting the interior of the building. Our geotechnical engineering recommendations addressed new and existing structural elements, which included spread footings, micropiles and underpinning with a combination of traditional hand-dug piers and micropiles.
During construction, we observed the installation of micropiles, earthwork and foundations (spread footings and wall footings), underpinning pits, cast-in-place concrete, masonry prisms, and Windsor probe testing.
Photos © Arizona State University