Cohousing communities are part of the new cooperative economy in the United States and are predicted to expand rapidly in the next few decades as individuals and families seek to live more sustainably, and in community with neighbors. Since the first cohousing community was completed in the U.S. – Muir Commons in Davis, California – more than 160 communities have been established in 25 states plus the District of Columbia, with more than 125 in process. Most cohousing communities are intergenerational with both children and elders; in recent years, senior cohousing focused on older adult needs have grown. These communities come in a variety, but are often environment friendly and socially sustainable.