Browse 13 Washington Agriculture businesses available for sale on BizBuySell. The most King County, Washington businesses for sale listings including franchises, opportunities and businesses.The Washington Food and Farm Finder is an online portal to connect with farms, food businesses, and food system organizations across Washington State. Washington businesses for sale with new listings added every day! Learn how to get a new food business permit, renew an existing permit, or submit construction plans for retail food businesses. Browse 308 businesses for sale in King County, WA on BizBuySell. BizQuest is the Internet's leading businesses with owner and seller financing for sale marketplace. Real estate excise tax (REET) is a tax on the sale of real property. Real property, or real estate, means any interest, estate, or beneficial interest in land. Some food service operations are exempt from the food code and do not need a food business permit.