Stepping off the elevator directly into the New York penthouse of Jane Hertzmark Hudis and Dr. Clifford Hudis, you can't help but reflexively take off your shoes. Clearly the city's grit and grime have no place in this pristine Upper East Side home, which bears the minimalist stamp of its designer, architect Lee F. Mindel of the Manhattan firm Shelton, Mindel & Associates. In stocking feet, you immediately and viscerally–experience the luxuriousness of the pale-hued apartment