New plans envision a forest of towers that would dwarf the city’s iconic TransAmerica tower. The plan “envisions a cluster of thin towers rising from 2 acres at the northwest corner of First and Mission streets. The cluster would include two 1,200-foot towers, two 900-foot structures and a 600-foot companion.” The project is “the focus of a skyscraper design competition seeking what the guidelines describe as ‘an iconic presence that will redefine the city’s skyline.’ As many as a half-dozen teams are rumored to be putting together bids.”