The Marin County Child Care Commission mailed a letter last month asking Bolinas-Stinson Union School District board members to take measures to ensure the Stinson Beach Montessori Preschool can continue without an interruption. The privately operated preschool has rented a classroom on the Stinson campus since 2004, but the preschool’s lease is set to expire this summer after years of complaints about overcrowding from parents and teachers. The Child Care Commission’s letter claimed the preschool…