Vents rising
Vent structures will range from one to nine stories tall.
Work on first structure, at 96th Street, starts in 2012.
13 homes taken through eminent domain to build them.
MTA says newsstands will be in six of the eight structures.
Phase One of the Second Avenue subway, extending Q train from 57th to 96th Street, is scheduled to be completed in December 2016 and cost $4.45 billion.