LONDON - U.S. banks are adding to their office space outside London, Europe's traditional finance center.Canary Wharf Group PLC, a London-based property developer, said it has leased 590,000 square feet of office space and will erect two buildings to accommodate demand for space by such banking companies as Citigroup Inc and Bank of New York Co., as well as investment banks Morgan Stanley Dean Witter & Co. and Bear, Stearns & Co.

Citigroup is also leasing 315,000 square feet at 25 Canada Square, which is still under construction, adding to the 600,000 square feet that the largest U.S. financial services company had already leased there. With its existing space in 33 Canada Square, Citigroup has leased about 1.5 million square feet in Canary Wharf, the financial center three miles east of London.

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