^^^It actually looks like a landing bay, I assumed for Taxis/transport but I can make out what looks like missiles or torpedoes, so it may be a starfleet base of some kind designed to scramble fighters in the event of an attack.
Either way, I think it's based in London.
BTW, is anyone else put off by the mile wide saucer slicing through skyscrapers at the end? THE MILE-WIDE SAUCER. >_<
You do know this Enterprise is meant to be much bigger than the original? 725 meters long according to the Bluray, but possibly as large as 1200m (the Art of the Movie book)