"Wal-Mart's widespread expansion of its "supercenters" -- which are at least 50% larger than the typical Wal-Mart and carry groceries -- appears to be driving much of the regulatory activity. Recently adopted or proposed ordinances in Los Angeles, Oakland, Alameda County, Contra Costa County, Turlock and elsewhere specifically limit stores of a certain size, usually about 100,000 square-feet, to no more than 5% to 10% of floor area devoted to non-taxable goods. A Wal-Mart supercenter is usually 180,000 to 230,000 square feet, and groceries fill more than one-third of the stores. The restrictions could also hit some Costco and Target stores."
Thanks to Chris Steins