The Hawks and Emory Healthcare announced plans Tuesday to partner on a long-awaited sports medicine center and training facility at a news conference at Philips Arena. The 90,000-square-foot complex will cost $50-plus million, according to a person familiar with the situation, and be privately funded. It will be located on Executive Park Drive in Brookhaven. Plans for the facility are complete and the groundbreaking is expected in mid-May to be ready for the 2017-18 NBA season.