“Frank Gehry and his one-time competitor Renzo Piano are not the house architects of New York City. That distinction belongs to Skidmore Owings and Merrill, the lofty developer to Manhattan’s biggest guns in business and real estate. But the new New York that is taking shape—with its ambitious towers, its cities within a city like the far West Side, Ground Zero and the Atlantic Yards—belongs to these two. So far, the two émigrés seem to be splitting the pie like a couple of New York old-timers.”