Plans have been submitted to Danbury Commissions for a 425,000-square-foot mixed use development off Mill Plain Road.  The proposal is for 30 acres owned by Westconn Park LLC Development.  The property is adjacent to West Conn's Westside campus and would have more than 3 acres set aside as a recreational area.  Plans call for 200,000 square feet of housing units with a clubhouse pool and tennis courts, 80,000 square feet for an assisted living facility, and 50,000 square feet for a corporate building.  Three areas for retail space have been proposed.  Albert Salame, who has owned the property for 20 years, says tenants for 330,000 square feet of the space have been secured.  The Salame Companies, the Morganti Group Inc and Griffin Living are on board.  Griffin would operate the assisted living facility.