More than 20 years after Academy Award-winning actor Sidney Poitier scooped up an apartment on Manhattan’s Upper East Side, the park-view duplex residence has popped back up for sale.On the market for $11.5 million with Corcoran’s Chris Kann, Poitier and his wife, Joanna, paid just $2.5 million for the Fifth Avenue pad back in 1994. According to New York Magazine, Poitier bought the apartment so they...