When I first saw the exterior rendering of Tour Carpe Diem, I thought it would be a nice tower.... but now that I see those renderings of the roof, base, and interior, I am in awe! Are they sure Robert AM Stern designed that?
As for GAN, considering it still looks great after three decades and being a 70s design, it really seems to me that it is a quality and timeless design now. The new plan looks good but not worth it in place of a classic tower like GAN.