Bayside is a 165-acre former airport site in Fremont that was a checkerboard of wetlands and uplands. The site had been diked for almost a century, though, and the on-site wetlands were suffering as a result of their isolation. However, these wetlands also hosted the salt marsh harvest mouse (Reithrodontomys raviventris raviventris; SMHM), an endangered species. Zentner Planning and Ecology developed an innovative plan to restore wetlands on one edge of the site while allowing development to occur on the remainder. Key to the plan’s approval was the successful creation of mouse habitat on the restored wetlands. We demonstrated the successful restoration of the wetlands and the salt marsh harvest mouse population and Federal, State and local permit approvals for the development project followed.