Bargain Sale To A Charitable Organization

Bill Gates wants to make a large, non-cash charitable donation to save the pandas, or zebras, or whatever. He agrees to sell a valuable piece of real estate to the Foundation for Pandas, Zebras, and Other Black & White Animals. Because it's a charitable donation, he can either sell the property for a below-market price or exchange it for a similar property of a lower value. The difference in values between the two properties would then be considered a gift, and the panda/zebra populations of the world could rejoice.