By Keat Foong, Executive EditorDedham, Mass.—Hebrew SeniorLife announced it has closed on the biggest tax-exempt bond issue in U.S. history for the development of a non-profit continuing care retirement community (CCRC). The $457 million in tax-exempt bonds will be used to fund the development of NewBridge on the Charles, a state-of-the-art CCRC located on the 162-acre Dr. Miriam and Sheldon G. Adelson Campus in Dedham, Mass. “This financing will help us bring to reality a unique new community and health care facility that will expand our ability to serve older adults in the Boston area,” says Len Fishman, president and…