I personally wonder when the anti-zombie uprising will begin. The common folk can't be too happy that the only livable high-rise real estate is populated by a bunch of heavily armed, resurrection-addicts... It probably smells down there too.
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The next patch you will be able to go to the city during missions. Ok, well, bungie is just going to make you run around the tower and call it a new earth mission. But the gunsmith will have a sign above him that says "Ye Ole Pub" and the Cryptach will have one that says "Pizza Place".