NORWALK, CONN. — Avison Young has arranged the sale of the Matrix Corporate Center in Norwalk. The sales price was not disclosed. Located at 535 Connecticut Ave., the five-story property is currently 74 percent leased to a tenant roster that includes Crius, UBM and Belvoir. Sean Cahill, Gary Lyons and Blake Thomas of Avison Young represented the seller, Matrix Norwalk LLC, in the transaction. The buyer was Hanover Norwalk Investors LLC.