The final section will wrap around the Hudson Rail Yards between West 30th and West 34th streets.
Construction will be closely coordinated with the development of Hudson Yards, which will feature more than 12 million square feet of new office, residential, retail and cultural space.
Officials say the final section will cost about $90 million. Construction is expected to be completed by the end of 2013 with a full public opening scheduled for the spring of 2014.
The designs were presented at a community meeting on Monday night.
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