Hudson's was the second-largest department store by square footage to the company who has a flagship store where?
Hudson's:  Hudson's flagship store, on Woodward Avenue in Downtown Detroit (demolished October 24, 1998), was the tallest department store in the world in 1961, and, at one time, claimed to be the second-largest department store, after Macy's, in the United States, by square footage. Macy's Herald Square: Macy's Herald Square, originally known as the R. H. Macy and Company Store, is the flagship of Macy's department stores, located on Herald Square in Manhattan, New York City.
Manhattan, New York City