ESA headquarters is listed as in Paris. I'm not seeing any US bases near Paris. Orly used to be a US base but was shutdown in 1967 and is now a civilian airport.
Sorry I meant the European Space Operation Centre (ESOC) in Darmstadt, Germany. Its almost neighboring the dagger complex [https://en.wikipedia.org/wiki/Dagger_Complex] of the US INSCOM/NSA.