Thunderbolts* confirms that it was indeed Valentina and O.X.E. Group who purchased Avengers Tower from Tony Stark following the construction of the Avengers Compound in upstate New York.

According to New York City real estate vet Michael T ... or enough to purchase one Avengers Tower.) Stark Tower’s uppermost floors featured an Iron Man landing pad, Tony Stark’s lavish ...

Tony Stark sold his famous New York City skyscraper in Spider-Man ... about who actually bought the building that became Avengers Tower. Was it the Fantastic Four? Kingpin? Norman Osborn?