Mixed-use properties are some of the most interesting deals in real estate. Retail on the ground floor. Apartments above. One building. Multiple income streams. Or a live-work space in a converted warehouse. A restaurant with residential units. A small office building with a coffee shop tenant on the corner. The concept is straightforward. Mixed-use real estate financing is not. Because mixed-use properties don't fit neatly into any single lending box — and most banks struggl