A partnership that includes Washington State University could break ground next year on a Riverpoint Medical and Health Sciences Institute that would take advantage of the growth in health-related research and teaching at the university’s Spokane campus, project participants say. WSU would lease 3.6 acres of land to Denver-based NexCore Group LP, which would construct a 60,000-square-foot building, or larger, depending on tenant interest. Arthritis Northwest would be the lead tenant responsible for recruiting doctors, therapists and other practitioners to the venture.