DivcoWest announced that 250 Water Street at Cambridge Crossing (CX), the new 43-acre neighborhood under construction at the intersection of Cambridge, Somerville, and Boston, is now fully-leased following an expansion of Bristol Myers Squibb’s presence in the building.    BMS is adding the remaining 113,000 square feet to its initial lease, which was announced in August of last year. The new 480,000 square-foot state-of-the-art science and technology building is expected to be completed in 20...