My fraternity's building at the University of Washington was attractive, but I always thought the best of the lot was the Phi Gamma Delta ("Fiji") house before one of its wings was expanded, taking a slight edge off the design. Unlike most of the Greek system buildings at the UW, the Fiji house was designed by an outsider, not a local architect. That outsider was Walter Mellor (1880-1940) of Philadelphia. It seems that Mellor was a Fiji and designed a few other chapter houses. Background on Mellor can be found here and here.
Mellor's firm was Mellor and Meigs, and for a while Mellor, Meigs and Howe -- Howe being George Howe, later of Howe and Lescaze, designers of the early modernist icon Philadelphia Savings Fund Society Building (1932).
Mellor's firm was quite successful, specializing in expensive residences featuring Norman and sometimes Tudor and other historical themes. The images below were selected to feature a design quirk of Mellor's -- use of tall, sometimes two-story vertical windows often placed above main entrances. (The Norman style includes use of large, narrow windows, but Mellor often chose to exaggerate this.)