An important sidebar to the history of Sears, Roebuck & Company in Duluth is the fascinating tale of the shopping-center-on-pillars that wasn’t. A plan was hatched in the late 1970s for Harbor Square, a roughly $70-million, 574,000-sq.-ft. shopping plaza to be built on stilts over Interstate 35 in Downtown Duluth. Failure to lure Sears as an anchor store was a key element that led to the project’s downfall.