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NEW YORK CITY — L&L Acquisitions has negotiated a lease renewal and expansion for office space located in Midtown Manhattan, New York City. Cornerstone Research, a national strategic and economic consulting firm, has renewed and expanded its tenancy to 34,891 square feet at 599 Lexington Avenue. Cornerstone will continue to occupy floors 42 to 44 while adding expansion space on 41. The long-term lease renewal also includes options for future growth. The 47-story office building is owned by Boston Properties. The deal was brokered by David C. Berkey of L&L Acquisitions, the brokerage arm of Manhattan-based L&L Holding Company, a privately owned real estate investment company.