New York’s Dia Foundation gives a look at what will be its new home. “Dia could well be described as the art world’s un-Guggenheim. Both institutions are developing a network of spaces; both embrace contemporary art. But while Mr. Krens has pursued outposts around the world designed by big-name architects like Enrique Norten and Frank Gehry, Mr. Govan is fashioning a network of spaces closer to home that are as unobtrusive as possible.”