Do you know Singapore has 4 of the 8 atrium hotels still standing and designed by John Portman ? The Regent, Singapore (originally the Pavilion Inter-Continental) The Pan Pacific, Singapore The Mandarin Oriental, Singapore The Marina Mandarin, Singapore (now PARKROYAL COLLECTION Marina Bay). The Hyatt Regency Atlanta: Portman's first atrium hotel. The Westin Bonaventure Hotel, Los Angeles The New York Marriott Marquis The Renaissance Center, Detroit