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NEW YORK CITY — Holding company Tide Rock has signed a two-year, 4,123-square-foot office lease at 340 Madison Avenue in Manhattan. The company is taking space on the 22nd floor of the 750,000-square-foot building. Jack Cohen of Spaces CRE represented the tenant in the lease negotiations. William Elder and Andrew Ackerman represented the landlord, RXR, in an internal basis.