 Regulation was introduced by the city council to control the problem in 1892, with support from the real estate industry who hoped to slow the construction of additional office space and shore up their diminishing profit margins.The height of new buildings was limited to , with lower height levels on narrower streets, effectively curtailing the construction of any taller skyscrapers.The early years of the 20th century saw a range of technically sophisticated, architecturally confident skyscrapers built in New York; academics Sarah Landau and Carl Condit term this "the first great age" of skyscraper building.