Quattro, a multi-tenant office building at 4310-4350 E. Cotton Center Blvd. in Phoenix, sold for $43.5 million. Tracy Cartledge, Bob Buckley and Steve Lindley of Cushman & Wakefield’s Phoenix office negotiated the transaction on behalf of the seller, Buchanan Street Partners of Newport Beach, California. Boston-based Albany Road Real Estate Partners purchased the property. “With institutional-quality design and construction, a central Cotton Center location, and blue-chip tenancy, Quattro…