Roosevelt was also a prime mover behind the creation of the New York Zoological Society, for whom the partners designed the original nucleus of buildings (1899–1910, now called the Astor Court) as a series of pavilions symmetrically grouped round the large sea lion pool, all in a sturdy brick and limestone Roman Ionic and Doric, with the heads of elephants and rhinos, lions and zebras projecting festively from panels and friezes. The central Administration Building (1910), offering an arched passageway to the zoo's outdoor spaces, has complicated domed spaces formed of Guastavino tile.