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PLANO, TEXAS — Riken Vitamin Co. has signed a 12,653-square-foot lease in Plano. The Japanese producer of food additives and vitamins is relocating from California to R&D at Legacy, a 374,275-square-foot flex development. Doug Carignan and Landon Brune of CBRE represented the tenant in the lease negotiations. Chase Lopez, James Mantzuranis and Sam Bass of Stream Realty Partners represented the landlord, BH Properties.