In 2002 , Boston Properties bought the building for $ 1.06 billion beating out other bidders including Brookfield Office Properties , Equity Office Properties , Vornado Realty Trust , RFR Holdings , and the Paramount Group . Boston Properties paid over $ 630 per square foot , which was the highest price ever paid for an office building at the time . Boston also bought the nearby Citigroup Center . Citigroup then leased its headquarters from Boston Properties through 2017 . After the September 11 attacks damaged much of their headquarters at Brookfield Place , Lehman Brothers leased in the building until their 2008 bankruptcy . Other former tenants included law firms Caplin & Drysdale , which moved to 600 Lexington Avenue and Wilmer Cutler Pickering Hale and Dorr , which moved to 7 World Trade Center
September 11 attacks
September 11 attacks
399 Park Avenue