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BOCA RATON, FLA. — Colliers International has negotiated a 10,610-square-foot office headquarters lease for Nightingale, a registered nurse staffing company. The lease is for 89 months and costs $1.4 million. Nightingale is relocating to 7800 Congress Centre from 6401 Congress Ave., where it occupied 16,455 square feet. Bob Schneiderman of Colliers represented the tenant in the transaction.