When people think of dystopian life, they imagine crowded spaces and limited freedom. In China, one massive apartment complex seems to embody that vision. The Regent International in Qianjiang Century City, Hangzhou, is a 675-foot-tall building completed in 2013. Designed by Alicia Loo, chief designer of Singapore’s Sands Hotel, it holds an estimated 20,000 residents and is shaped like an...