We have known for months that Apple was planning a major renovation for its busiest 24-hour flagship store on Fifth Avenue, but now comes word that the refresh will include a doubling of the store's size from 32,000 to over 77,000 square feet —and it's going to take a while. Apple's current store incorporates what was once a below-grade open-air plaza in front of 767 Fifth Avenue, better known as the General Motors Building. one presumes that the renovation will capture basement, or possibly sub-basement space that is beneath the GM Building itself, which should be an elaborate feat. None of the changes are expected to be visible from the street, and the view of the signature "Cube" entrance should remain unchanged. As earlier reported, Apple will be temporarily taking over a substantial part of the former FAO Schwarz store in the GM Building along West 58th Street (pictured above) while renovations proceed, but it is expected to be there until well into 2018, meaning that it will be a while before the space's next designated tenant, Under Armour, is able able to take over and build out its own store.