Richman owns a river front parcel of land in the State of Sunlight within the City of Purls. He was planning to build boat dock with boat slips along the river front of his property. Before he can execute his plan, the city changed its zoning ordinance to prohibit the building of structures of any kind within 50 feet of any natural body of water, including rivers, lakes, and streams. Richman claims that his constitutional rights have been violated. What is the basis of his claim and what should be the outcome if he sues the city?