Other notable designs include One Park Plaza, the Federal Aviation Administration building in Hawthorne, and El SegundoвЂ™s Hyperion Waste Water Treatment Plant (1998). By reversing the mullions (vertical elements that separate windows) inward rather than outward, the system enabled completely new ways of вЂњwrappingвЂќ buildings in glass, creating smooth curtain walls.ДMJM introduced the system in the 1969 Century City Medical Plaza, though the best-known local example is the undulating Roxbury Plaza/Manufacturers Bank building at 9701 Wilshire Boulevard in Beverly Hills. In the late 1960s, under the direction of renowned architects Cesar Pelli and Anthony Lumsden, DMJM pioneered the glass membrane (skin) design system. A similar look would appear on the Pasadena campus of Ambassador College, whose master plan the firm created in 1965. Meant to showcase the versatility of concrete, the buildingвЂ™s exquisite concrete latticework made a significant statement. The firmвЂ™s Los Angeles debut came in the form of the American Cement Building (1964) next to MacArthur Park. military projects its signature strengths were in engineering and structural design. Johnson, and Irvan Mendenhall, DMJM (pronounced Dim-Jim) literally changed the face of corporate architecture in the late twentieth century. Daniel, Mann, Johnson & Mendenhall (DMJM)ДЇounded in 1946 by Phillip Daniel, Arthur Mann, S.

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