ODIN headquarters is located in Paris, France and is the base of operations for ODIN. It is an extremely large building and superior to ISIS headquarters. Based on size, shape, color, and surrounding buildings, Odin is most likely headquartered in the Tour Montparnasse
The office of Len Trexler, is located on one of the upper floors and has a wide view of a park area. Their parking garage is stocked full of company cars, some of them Ferrari's. The bottom floor is a large lobby and waiting area.