While it only occupies a single block, this park-as-building is substantial enough to represent a neighborhood of its own. Each level is covered in foliage, ranging from creepers to flowers to lawns to trees. Artificial streams run through the structure, and an artificial waterfall graces the interior. In some areas, tree-lined “hallways” cut through the building. Apertures in the structure let in light and moisture. Ramps and stairways connect the different levels. Most of the plants are native to New England, but a sealed section contains tropical plants like banyan trees and lianas.