I must say that’s really an important question. I would agree with Super Nerd here, Even I think that Osborn bought it and marvel was definitely planning to do something with that tower.
I also agree with @super nerd but i also think that the fantastic 4 can also buy this tower to make it Baxter building.
It’s most likely the Oscorp building or the Baxter building.
it is most likely going to be norman osborn as he has not made an appearance in the mcu and he has a lot of money.
Avenger Towers was being rebuilt in Spider-man: Homecoming, so I think its a high possibility that Osborn might have bought the towers.