The architecture of metropolitan Detroit continues to attract the attention of architects and preservationists alike. With one of the world's recognizable skylines, Detroit's waterfront panorama shows a variety of architectural styles. The post-modern neogothic spires of One Detroit Center refer to designs of the city's historic Art Deco skyscrapers. Together with the Renaissance Center, they form the city's distinctive skyline. Detroit's architecture is recognized as being among the finest in the U.S. Detroit has one of the largest surviving collections of late-19th- and early-20th-century buildings in the U.S. Because of the city's economic difficulties, the National Trust for Historic Preservation has listed many of Detroit's skyscrapers and buildings as some of America's most endangered landmarks. The suburbs contain some significant contemporary architecture and several historic estates. Skyscrapers In the 1880s, Gilded Age architects such as Gordon Lloyd, Harry J. Rill, Henry T Brush, Julius Hess, John V Smith, Elijah E Myers, Alamon C Varney, Mortimer L Smith, Peter Dederich, Joseph e MiIls and the firms Donaldson & Meier, Malcomson & Higginbotham and Mason & Rice who had designed churches and residences in the most exclusives neighborhoods (Woodward Avenue, Brush Park, Jefferson Avenue and W Fort Street), turned their attention to office and commercial buildings. They designed some of Detroit's ornately stone-carved 19th-century tall buildings, many of which are still standing. Lloyd's Romanesque six-story iron-framed Wright-Kay (1891) at 1500 Woodward Ave and his R. H. Traver Building (1889) at 1211 Woodward are prime examples. The Wright-Kay, or Schwankovsky Building, was among the first to have an electric elevator. Rill designed the ornate Beaux-Arts facade of Detroit Cornice and Slate (1897) at 733 Antoine. The six-story Romanesque Globe Tobacco Building (1888) at 407 E. Fort, built by Alexander Chapoton, is another of the city's early surviving commercial buildings. Detroit's Victorian-styled Randolph Street Historic District contains some of the city's oldest surviving commercial buildings. The commercial building at 1244 Randolph Street dates from the 1840s, a rare survivor from the Antebellum period. Most of Detroit's expansion and development took place later. At 12 stories, the steel-framed United Way Community Services Building (1895), at 1212 Griswold, originally known as the Chamber of Commerce Building, qualifies as Detroit's oldest existing skyscraper. The 10-story Hammond Building (1889), now demolished, is considered the city's first historic skyscraper. The Qube in the Detroit Financial District was developed on the Hammond Building site. The city has numerous architecturally significant