One Madison is a luxury residential condominium tower located on 23rd Street between Broadway and Park Avenue South, at the foot of Madison Avenue, across from Madison Square Park in the Flatiron District of Manhattan, New York City. The building's official address and main lobby entrance is at 23 East 22nd Street, rather than at 1 Madison Avenue; there is no public entrance on 23rd Street. The building as constructed has 53 residential units across 60 stories. Construction started in 2006, and it topped out during 2010, but remained incomplete for another three years due to financial difficulties. At a height of 621 feet (189.3 m), One Madison is one of the slenderest buildings in the world, with a height-to-width ratio of 12:1. History Although much of the area nearby is included in various historic districtssuch as the Ladies' Mile Historic District, Gramercy Park Historic District, and Madison Square North Historic Districtthe location of One Madison is not, enabling the building to be constructed "as of right" with the transfer of air rights from the shorter buildings that surround the site. Construction When the building was originally announced, it was to be 47 stories and called The Saya; the name was changed to One Madison Park around the time that construction began in 2006 and then to One Madison after it was taken over by the Related Companies. The building as constructed has 60 stories. By April 2010, the building had topped out, but was still not complete, having run into financial difficulties. Sales of residential units had stopped, but the appointment of a receiver on April 15 allowed sales to start again. The building continued to be mired in financial and legal problems, including multiple lawsuits and allegations of fraud, and was forced into bankruptcy by some of its creditors in June 2010. At one point, a 22-story building designed by noted architect Rem Koolhaas was to be the building's "companion" on 22nd Street, but later plans called for an 11-story building designed by CetraRuddy, the firm that designed One Madison; although at the time construction began in January 2013, permits had reportedly been issued for a 6-story building, which will include the entrance lobby and two duplex apartments. The companion building, designed by BKSK Architects to feature a terracotta and glass facade, will be the primary entrance to the building. Post-completion By 2013, ownership of the building had