The 25-year-old Lan Su Chinese Garden, a landmark in Portland's Old Town/Chinatown, is planning a major expansion on its neighboring Block 24, transforming the space that's now home to a few parking spaces and not much else into a lively cultural center that would include classrooms, meeting rooms, an art gallery, demonstration kitchen, banquet facilities, performances spaces, and, in its outdoor spaces, plazas, greenhouses and gardens.