In that regard, it would make perfect sense to learn that Reed Richards and the other three members of the Fantastic Four actually purchased Avengers Tower for the purpose of turning it into the Baxter Building sometime during Phase 4.
In Spider-Man: Homecoming we learned that Tony Stark decided to sell Avengers Tower in order to permanently relocate Earth’s mightiest heroes to the upstate New York installation.
Who knows, maybe we will even see the cosmic storm that turns them into heroes sometime between now and the release of Avengers 4 in 2019?
The buyer of the tower is never made clear, but given the amount of money necessary to purchase something as lavish as Avengers Tower, we have to assume that it is a group with resources.