Kansas City, Mo.-The headquarters of the former Farmland Industries Inc. was slated to be auctioned Aug. 17. A minimum price of $13 million was set for the 260,000-square-foot building, which opened in 2001 at a cost of about $35 million. The sealed-bid auction is being conducted by Sheldon Good & Co. of Chicago. The building, at 12200 N. Ambassador Drive near Kansas City International Airport, is owned by Pritzker Realty Group of Chicago. The company had been marketing the building for $20 million before deciding to pursue the auction alternative.