Jeannie and KaWing Yuen purchased a duplex corner apartment in 101 Warren Street, pictured here, in 2008 for slightly over $4.45 million, according to public records. 101 Warren is a mixed-used development with 227 condominiums and a Barnes & Noble and Whole Foods on the lower floor, so close that 'I can run down in my pajamas if I needed to pick something up,' says Ms. Yuen.