While the Miami city commission voted earlier this month for a plan allowing more residential and mixed-use development along the river, many businesses on the waterfront remain opposed to the decision. The plan, called “Miami River,” will affect the 5.5-mile-long waterway between the Biscayne Bay and Miami International Airport. The comprehensive zoning plan was spurred on in part by three successful lawsuits last year that blocked condo projects in areas zoned for commercial use. The suits were filed by the Miami River Marine Group, a private association of marine businesses. The river currently has 5,215 condo units under construction and another 6,500 in planning stages, according to the Miami River Commission.