 The economic boom of the 1920s and extensive real estate speculation encouraged a wave of new skyscraper projects in New York and Chicago.New York City's 1916 Zoning Resolution helped shape the Art Deco or "set-back" style of skyscrapers, leading to structures that focused on volume and striking silhouettes, often richly decorated.Skyscraper heights continued to grow, with the Chrysler and the Empire State Building each claiming new records, reaching and respectively.