Mortenson Construction has joined Hamilton Partners in its new office at 300 Park Blvd in Itasca. The firm outgrew its Elk Grove Village HQ, where employees were scattered across three different sites. Of Mortenson’s 200 Chicago employees, 50 executives and project support team members will occupy the new office full time. Mortenson built out the space with hoteling workstations that can be used by project engineers, superintendents and other field employees who come into the office for training, meetings and other work. Mortenson’s notable recent projects include Ann & Robert H. Lurie Children’s Hospital, modernization and expansion of Halas Hall for the Chicago Bears, the new Jeanne Gang-designed residence hall at the University of Chicago and the $500M Mercy Health hospital and physicians’ office complex, under construction in Rockford.