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a nonprofit developmental preschool A playfilled environment for children ages 2 through 5 to develop socially emotionally physically and intellectually. a nonprofit developmental preschool A playfilled environment for children ages 2 through 5 to develop socially emotionally physically and intellectually. Built by the community for the community 60 years of serving Evanston and surrounding communities 60 years of serving Evanston and surrounding communities Unity Preschool is a nonprofit developmentally appropriate preschool that has served Evanston and surrounding communities for over 60 years. We are conveniently located in a bright and open space in the heart of the Noyes Street business district.