Legislation in the New York City Council (Int. No. 338) scheduled for a vote on Thursday, July 28, 2011, will facilitate the installation of rooftop greenhouses by exempting them from height or bulk restrictions. The bill amends the building code by adding greenhouses to a list of other rooftop structures (such as water tanks and air conditioning equipment) that do not count towards height and floor area ratio calculations. Only greenhouses that are less than one-third of the area of the roof qualify for this exemption, however, so larger structures may still bump up against size limits.