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I don't believe the building that Outlanders occupied is the structure that housed Sandy's but that was the location.
From Wikipedia
Sandy's was a chain of American fast-food restaurants begun in 1956 by four entrepreneurs from Kewanee, Illinois: Gus "Brick" Lundberg, Robert C. Wenger, Paul White and W. K. Davidson. Sandy's was the ancestor of the midwestern franchises of the Hardee's restaurant chain. The Sandy's name was no longer used after the 70's as most locations switched to Hardee's.