Despite widespread popular belief, U.S. military installations abroad and U.S. diplomatic or consular facilities are not part of the United States. It is NOT sovereign soil. The land is still owned by the host country, but diplomatic missions are exempt from local law and in almost all respects treated as part of the territory of the home country. For example the host country may not enter the representing country's embassy without permission, but they still own it.
Interesting. Thanks for the info.