 Heritage Hill was added to the National Register of Historic Places and the Michigan State Register of Historic Sites in 1971.The Master Plan of Heritage Hill, approved by the city in 1988 and incorporated into the city's 2002 master plan, helped shape the restoration and development of the neighborhood's many historical properties, as did the 1992 Prospect Plan.When the city approved the Mary Free Bed Rehabilitation Hospital's parking ramp, it attached funding to carry out the prospect plan as one of the conditions.