Buy a warehouse. Lease it to Amazon. Triple your money
[{"id": "eohj2r8", "text": "Then retire because that rarely happens.", "replies": [], "depth": 1}, {"id": "epkt12z", "text": "Realistically it was probably more like a double since they spent $6 million renovating the property and likely another couple of million in lease concessions to Amazon.  Still impressive though!", "replies": [], "depth": 1}]