This paper employs a systems framework to explore sustainable agriculture as a source of food in Buffalo, NY and other Rust Belt cities that exhibit an abundance of abandoned property and vacant lots in core urban areas. Considering land as a common stock proves helpful for determining whether or not a system is sustainable, such that stocks of natural resources are not depleted faster than they can be replenished. By identifying feedback relationships in the local food system, planners and activists in these cities are redesigning their food production and distribution systems to meet the needs of food-insecure residents.