Even though two San Fernando Valley businesses, Arleta’s Green House Nurseries and Northridge’s Live Art Plantscapes, were built on land owned by the Los Angeles Department of Water and Power and with the utility’s approval, new DWP demands could possibly put them out of business, the Los Angeles Daily News reports. A recent letter received by each business states their greenhouses need to be replaced with smaller ones, but the owners argue their equipment cannot be decreased in size.