333 Park Avenue is a 41-story office building that from 1961- 2015 was the world headquarters of Citigroup in Manhattan. The company moved into the building from 55 Wall Street in 1961, and from there to 388 Greenwich Street in Tribeca in 2015. The building occupied the entire block between Park and Lexington Avenues and 53rd to 54th Streets. The building lot was assembled by Vincent Astor who initially planned to build a 46-story Astor Plaza on the site. Astor had problems completing the assembly of the lots of most residential buildings and a pharmacy held out. In 1974, the company opened the Citigroup Center annex across Lexington to the east In 1987, Citigroup sold one third of its interest in the building along with two-thirds of its interest in Citigroup Center to Dai-Ichi Mutual Life Company for $670 million. At the time, Citigroup said it was moving many of its offices to a new tower in Long Island City, Queens. Citigroup moved out of two thirds of the building but kept the lower floors. Citigroup later bought back its interest in the building. In 2002, Boston Properties bought the building for $1.06 billion, which was the highest price at the time ever paid for an office building. Boston Properties also bought Citigroup Center. Citigroup leased its headquarters on a 15-year lease from Boston Properties. In 2013, Citigroup announced it will move its headquarters to 388 and 390 Greenwich Street in Tribeca, a complex it occupies and has owned and had owned until 2007, when it sold the building to SL Green Realty and now owns again since 2016.