Final answer:
Tilden was put on the project to build a park in California by Phelan. This project was known as the Tilden Park project, which aimed to provide recreational opportunities and preserve natural resources.
Step-by-step explanation:
Tilden was put on the project to build a park in California by Phelan. This project was known as the Tilden Park project. It was initiated by Phelan as part of his plan to create accessible and beautiful public spaces for the people of California. The Tilden Park project aimed to provide recreational opportunities and preserve natural resources.