Mayer Brown, a leading global law firm, announced today that the firm has signed a long-term lease for approximately 190,000 square feet at 1221 Avenue of the Americas.

Richard Spehr, partner-in-charge of Mayer Brown’s New York office, said, “We are thrilled to be moving into a vibrant and premier office space, which will serve as a great foundation to accommodate the firm’s clients, lawyers and staff for generations to come.”

1221 Avenue of the Americas, which was designed as one of four buildings constituting the modern expansion of Rockefeller Center on the west side of Sixth Avenue, is among the largest buildings in Manhattan to achieve LEED certification by the US Green Building Council.

Mayer Brown anticipates commencing the build-out of the new office space during the first quarter of 2014 with completion targeted by the end of 2014. The new office will encompass a modern design with the goal of maximizing efficiencies throughout, and will include first-class conference facilities with cutting-edge technology.

Mayer Brown Chairman Paul Theiss said, “Our new office space in New York further underscores Mayer Brown’s commitment to the New York market and will enable our New York office to continue to grow and flourish in order to best serve our clients in the world’s leading financial center.”

During the past three decades, Mayer Brown has grown its New York office to more than 200 lawyers, making it the firm’s second largest US office.

Mayer Brown was represented by CBRE brokerage professionals Robert Flippin, Andrew Sussman, Anthony Dattoma and Lauren Crowley. The space is owned and operated by leading real estate development and investment management firm The Rockefeller Group.

“Mayer Brown has an excellent reputation and is an ideal tenant,” said Edward J. Guiltinan, Sr., vice president and head of leasing in New York for The Rockefeller Group. “We are proud to have them as a tenant in 1221.”