^ i don't think they could ever add on a 400' hotel to the bloomingdales project under construction now. from an engineering perspective, i don't think it would be possible. in any case, zoning only allows for a maximum height of 160' if i'm not mistaken. the developers (with the help of redevelopment and former mayor willie brown) were pushing for a 400' hotel to make the project, in their words, "economically feasible".
i'm still holding out hope that they'll eventually do away with the pickwick hotel and replace it with a 5 star luxury hotel. maybe then, you'll get your 400' tower there!
