THE NEW 79,500-SQUARE-FOOT orthopedic ambulatory surgery and medical center in Waltham, Mass., was supported by a $75.6 million financing package led by The Washington Trust Co. / COURTESY THE WASHINGTON TRUST CO. WESTERLY – The Washington Trust Co. recently led a $75.6 million construction-to-permanent financing package for a new orthopedic ambulatory surgery center and medical office building in Waltham, Mass., the bank announced.