This document presents research and design concepts from GrowingCities, a think tank for urban agriculture. It features designs for rooftop greenhouses on housing, retrofitting large commercial buildings and a farmers market with aquaponics. It also includes small housing retrofits with five prototype designs like bench, tray, sill, desk and light farms. The light farm concept envisions using street lights for urban farming by elevating growing units that could be maintained by city workers. The document promotes developing new municipal systems to support expanding urban farming initiatives.