City officials Monday will weigh a comprehensive rezoning plan that could mean more housing in the South End and change Mill River Park’s zoning to keep it a park forever. The vast majority of rezoned land belongs to Mill River Park and has been parkland for years, but the area also includes some properties along Main Street. Most are owned by the Stamford Housing Authority, including the subsidized housing complexes Stamford Manor and Augustus Manor. The Land Use Bureau coupled zoning changes to the Mill River corridor with a reimagining three plots near the Stamford Transportation Center, which is slated to get a face lift from the state. The state Department of Transportation is in the process of putting together a master plan for the surrounding area and is also building an $81.7 million parking garage adjacent to the train station.