"HL23", a residential building that hangs over the narrow linear park. London Terrace is located across Tenth Avenue, occupying the full block to Ninth Avenue between 23rd and 24th Streets. The Hotel Chelsea, New York City's first co-op apartment complex, was built at 222 West 23rd Street in 1883. The Emunah Israel synagogue, built in the 1860s as a Presbyterian church, is located a few doors to the west at 236 West 23rd. The block of 23rd Street between Fifth and Sixth Avenues is part of the Ladies' Mile Historic District. Designated a New York City landmark in May 1989, it is an irregularly-shaped district consisting of 440 buildings on 28 blocks and parts of blocks, from roughly 15th Street to 24th Street and from Park Avenue South to west of Sixth Avenue. East 23rd Street East 23rd Street, which runs between Fifth Avenue and the East River (FDR Drive), is one of the main thoroughfares of Gramercy Park. The 22-story Flatiron Building is located on the south side of East 23rd Street at the street's intersection with Fifth Avenue and Broadway, occupying the triangular parcel bounded by these two avenues and 22nd Street. The origin of the term "23 skidoo" is said to be from wind gusts caused by the building's triangular shape or hot air from a shaft through which immense volumes of air escaped, producing gusts that supposedly lifted women's skirts. The Metropolitan Life Insurance Company (MetLife), headquartered at 1 Madison Avenue at East 23rd Street, played a significant role in shaping the character of development along East 23rd Street in the early 20th century, constructing six buildings successively along the street and around the block to the corner of 24th. The tallest of these is the Metropolitan Life Insurance Company Tower, built in 1909 at the intersection of 24th Street and Madison Avenue. The tower, with its ornate clocktower faces, was one of Manhattan's first skyscrapers. For four years, until the construction of the Woolworth Building in 1913, it was the tallest building in the world. It also owned a building across the street, which was the location of the 23rd Street Fire that killed 12 firemen. A new apartment building, the current Madison Green, was announced for the site in the 1970s, but the building itself was not constructed until 1982. Another skyscraper on the street, the sixty-story, One Madison, was built in 2013. Media