Mohawk Commons, the Niskayuna retail complex, has been sold for $66 million to a national operator of open-air shopping centers. DLC Management Corp. of Tarrytown, Westchester County, acquired the property in a joint venture with DRA Advisors LLC. Mohawk Commons was purchased from Ohio-based DDR Corp. as part of a portfolio of 16 shopping centers, all but one of them in New York state.