Rockefeller Center was named after John D. Rockefeller, Jr., who leased the space from Columbia University in 1928 and developed it beginning in 1930. International Building North at the Center became the primary location of the U.S. operations of British Intelligence, British Security Coordination (BSC) during the War, with Room 3603 becoming the principal operations center for Allied intelligence, organized by William Stephenson, as well as the office of the future head of what was later to become the Central Intelligence Agency, Allen Welsh Dulles.
The world famous Christmas Tree is erected and lit in late November or early December. In recent years, the lighting has been broadcast live nationwide on NBC's Christmas in Rockefeller Center show and scheduled for the Wednesday after Thanksgiving. The tree, usually a Norway spruce 69 to 100 feet (21 to 30 m) tall, has been put up every year since 1933. In 2013, the Christmas Tree Lighting took place on the 4th of December.