A story about a Port Huron city ordinance that limits the types of businesses that can move into first-floor storefronts on parts of a main downtown street includes observations from Robin Boyle, WSU professor of urban planning. The ordinance was intended to ensure that downtown businesses remain retail oriented, but some building owners say the law unduly restricts them from filling their buildings. "It is quite difficult to impose a certain proportion of ground-floor uses that have to be retail when the economy is difficult," Boyle said. "There needs to be a balance."