To celebrate its new book American Fashion Designers at Home as well as raise money for its foundation, The Council of Fashion Designers of America opened the doors last week to a showhouse at The Aldyn, a new luxury condo building from Extell Development Company. Fashion designers collaborated with interior designers to fit out five separate apartments at the Riverside Boulevard building, which was designed by Costas Kondylis and Partners along with Roman and Williams, who headed up the interiors for the development. Here’s a look at the most successful collaborations, which will be on view to the public starting September 21.