De Pere's Common Council is set to vote May 5 on a redevelopment proposal that would turn an underdeveloped 2-acre site in the heart of downtown into a roughly $70 million mixed-use development along the Fox River.The project, proposed by New Land Enterprises, would bring nearly 200 residential units to the 100 block of South Broadway Street, along with three to four waterfront restaurants or other public retail spaces, new public outdoor space,…