Then. The postcard was produced sometime after 1962, as there is a zip code included with the publisher's information. The photo, however, could date from the 1950s.
From Retiring Guy's postcard collection
As described on the reverse side of the postcard.
WISCONSIN STATE HISTORICAL SOCIETY BUILDING
Located on the lower campus of the University of Wisconsin at one end of a large mall. At the opposite end of the mall is the University Library.
Now. Goodbye, elm trees? Hello, Helen C. White.