German term (edited): dreib�ndige Struktur

Another possibility, though I do think the GER term rather strange since it makes the three elements sound as if they are co-extensive - like stripes - rather than laid out like wings.

Despite urban homesteading, the Harborside festival marketplace, the Camden Yards ball park and other initiatives undertaken by the public and private spheres, Baltimore continues to epitomize the city as a permanent invalid of modern life. The Student Arts Center, designed by Tod Williams and Billie Tsien for Johns Hopkins University, adds a new layer to the city's cultural mix. Intended to bring art into an environment dedicated to science, the three-winged building creates a new campus landscape with courtyards, paths, and views.

http://www.nytimes.com/2000/09/10/arts/architecture-design-t...

A three-winged structure with a large open courtyard, designed by Yochanan Rattner, housed the Jewish Agency. Before the establishment of the State in 1948, the affairs of the Yishuv, the Jewish community in Palestine, were conducted in this building. In March 1948 a powerful bomb killed and wounded many persons and devastated the Keren Hayesod section of the building. It was later rebuilt with an additional story. The Jewish Agency (which is concerned with the immigration and integration of immigrants); Keren Hayesod (which handles financial support from world Jewry); and the Jewish National Fund (which deals with land development and afforestation) are still housed here.
http://www.jewishvirtuallibrary.org/jsource/Archaeology/jerm...

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Note added at 2 hrs (2009-04-19 21:52:57 GMT)
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http://books.google.com/books?id=K9mv1h9Gm1kC&pg=PA119&lpg=P...

In Bold's two earlier books, Webb was overshadowed by his master, Inigo Jones, and reduced to playing the bungling sorcerer's apprentice role with the Whitehall Palace drawings, where Palladian classicism has gone entirely mad. Here at Greenwich, with Jones safely buried and a firm commission in 1663 from Charles II, first to enlarge Jones's Queen's House with corner pavilions and second to build a new palace on the site of the old Tudor one, Webb must have felt triumphant. Either he would conceal Jones's exquisitely simple classicism with a three-winged structure topped by a dome, or he would so enrich Jones's concept with pavilions, an extra storey and Roman trimmings that the old sorcerer's spells would be quite forgotten.
http://www.timeshighereducation.co.uk/story.asp?storyCode=17...