Wisconsin’s largest home based multi-specialty clinic is one step closer to buying a hospital that’s connected with the clinic’s headquarters. Marshfield Clinic and Ascension announced an agreement today (Monday) on the purchase of Saint Joseph’s Hospital in Marshfield. Clinic C-E-O Susan Turney says terms will be disclosed later. She expects no major staffing changes among Ascension’s 15-hundred employees at Saint Joseph’s. Turney says the hospital’s operations could be handed to the clinic as early as June. Marshfield Clinic, which celebrated its 100th anniversary last year, was planning to build its own hospital on its Marshfield grounds but instead is buying the existing hospital, which just marked its 125th anniversary.