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Portman Holdings wants to convert an Alpharetta office park into a mixed-use development. Portman is asking the town to let him rezone about 20 acres of the Brookside office campus along Old Milton Parkway, not far from the Avalon development. The property includes two 5-story office buildings known as Brookside I and II.

According to plans submitted to the state and city of Alpharetta, Portman wants to redevelop the campus with more than 300 apartments, dozens of townhomes and retail space. The project would retain one office building or about 130,000 square feet.