A Class A office park near The Mall at Millenia has a new owner, thanks to an $86.5 million sale that looks to be Orlando's largest brokered office deal since 2002. Indianapolis-based Duke Realty Corp.'s (NYSE: DRE) related Millenia Lakes Development Co. LLC and Duke Millenia I LLC sold the Millenia Lakes office complex to CPF Millenia Office LLC, an entity related to Broomfield, Colo.-based real estate investment firm Cornerstone Holdings LLC, Orange County and state records showed. Cushman…