For years, it served as the main entrance to Reunion Country Club in South Hall. But now, some 35 acres that sits at Thompson Mill Road and Grand Reunion Drive could become part of a planned 800-home active adult community in Braselton. Reunion developer Pulte Home Corp. is asking the town, which is in Barrow, Gwinnett, Hall and Jackson counties, to annex and rezone the property, adding to 385 acres already approved for the new Del Webb at Chateau Elan.