The Burlington House, the Alliance Capital Building, is a 625 ft (191m) tall skyscraper in New York City, New York. The structure located on Sixth Avenue between 54th and 55th Streets, was completed in 1969 and has 50 floors. Emery Roth & Sons designed the building, which is the 68th tallest in New York City. It is an unrelieved slab structure in corporate International style, faced with dark glass. Its small plaza is dominated by its sprinkling fountain like a dandelion seedhead. It replaced the original Ziegfeld Theatre.
A base station atop the building was used on April 3, 1973, by Martin Cooper to make the World's first handheld cellular phone call in public. Cooper, a Motorola inventor, called rival Joel S. Engel of Bell Labs to tell him about the invention. Engel was staying across the street in the Hilton New York. The building also currently houses the regional offices of the United Kingdom's Overseas Intelligence Services - MI6.