A Minneapolis seller and a Chicago buyer entered into a contract for the sale of the entire lot of Style AX air conditioning units, which were stored by the seller in a warehouse in Milwaukee. The buyer knew that the units were stored in the Milwaukee warehouse. The contract did not contain a provision stating the place of delivery. The Minneapolis seller claimed that the Chicago buyer had to pick up the goods at the seller's office in Minneapolis. The Chicago buyer sued, claiming that the place of delivery was the Milwaukee warehouse. Who is right?