Kidder Mathews, a Seattle-based commercial real estate company, said Wednesday it has acquired the assets of Wessex Commercial Management, a Scottsdale property management firm. It's the latest acquisition by Kidder, which in recent years has grown to become the largest independently owned commercial real estate firm on the West Coast. Since its founding 50 years ago, the company has grown from four offices with 65 brokers and $22 million in revenue to a 22-office operation with 800 real estate…