I have a possible work around to get into the tower. Though I haven't tested it thoroughly. I tried the gun range for the first time because I wanted to check it out and then loaded up the tower from there. Ive had a fair bit of trouble getting to the tower at all and it loaded up fine. After several crashes trying to get to the tower directly, I tried again. Went to the gun range and then the tower and got in. Dunno if its just a fluke or if it actually works, but if it does, I hope it helps at least someone not claw their eyes out waiting on a fix