US retail giant Federated Department Stores Inc announced on Wednesday it is to open a massive new Macy's store at Fashion Square Mall in Scottsdale, Arizona, in 2002. The new unit will be based in a vacant Sears department store and will be a three-level, full-line department outlet, excluding furniture, of more than 250,000 square feet. Renovation of the space is scheduled to begin early 2002 with a store opening planned for next fall.