So I know this has probably been brought up before I got on this board but for some this may be new.
So I'm rewatching Avengers tonight and I see this piece of evidence that Avengers Tower will be in Avengers 2.
As we can see Stark has specs for rooms for each of the Avengers in his new building. And we all know there's only one reason that would be: Avengers Tower.
And here we can see the specs for Cap's room; bed and all.
Edited for the pictures