Urban Agriculture Incentive Zone

"State legislation [AB 551] approved in late September [2013] by Gov. Jerry Brown that allows cities and counties to create "Urban Agriculture Incentive Zones," in which vacant property taxes are dramatically lowered if a landowner agrees to dedicate his property to small-scale agricultural uses for at least five years." [SF Chronicle]

The city has to approve the ordinance, and it's unclear whether Oakland has done so (City Council was considering it at the end of 2013).

This is a really nice article that sums up a lot of the issues involved.