OAKDALE - Town of Islip officials have allowed a local university to develop land in Oakdale after the school agreed to preserve several historic buildings on the property. St. John's University currently owns the site, which was once a private estate and military academy. Islip officials have granted the school a zoning change that would allow them to apply for a 380-unit condominium project, but only if the mansion and three other buildings are kept intact. "With this trade-off, the buildings get saved and the community continues to get to enjoy this beautiful vista," says Islip Town Councilwoman Trish Bergin Weichbrodt. However, some residents say a condo complex would bring more traffic to the area and that they first learned of the plan shortly before a town hearing. The school still needs to apply for permits for the project to continue.