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Elevator Maintenance Notice Elevator B unavailable Tuesday April 8 and Elevator A unavailable Wednesday April 9. Mount Prospect Public Library Library Foundation Home About the Library Library Foundation The Mount Prospect Public Library Foundation MPPLF inspires growth and learning that enriches the community through culture and education. As a nonprofit 501 c3 organization separate from the Library our primary purpose is to provide funding for special programs and projects otherwise unattainable with tax dollars. Donate to the Mount Prospect Public Library Foundation Giving to Mount Prospect Public Library Foundation has never been easier.