Two local businesses have shut down: Cycle Bar, the cycling studio that opened on 5th between First and Garfield in late 2010, and Rivet, the jeans-oriented clothing store that opened in August 2011 on Seventh between Union and President.
Cycle Bar, like uber-trendy Soul Cycle and Flywheel, held daily classes where customers could participate in group rides accompanied by dim lights and music. The landlord also owns the spaces that are currently home to Le Pain Quotidien and Grand Central Oyster Bar.
Rivet was run by the same owners as the also-shuttered Slope Jeans, and there's currently one other shop in operation, in Carroll Gardens. Many thanks to a tipster for letting me know that the whole shop has been emptied out.