Duke Realty Corp. is developing a 614,880-square-foot industrial building in its Camp Creek Business Center near Hartsfield-Jackson Atlanta International Airport. The project will be developed as a speculative building, meaning it’s being started without any tenants signed to leases. It’s one of numerous spec projects across metro Atlanta. Duke Realty expects to finish the building in January. Duke Realty decided to launch the project because of strong interest over the past 18 months from…