Definitely CBS. I'm biased, but it seems like an easy choice for a few reasons. There is an entire Real Estate program here, the IM program is top notch, and overall it will serve you really well. I am on the board of the Hermes society - feel free to reach out to anyone on there that fits your needs:
https://apply.gsb.columbia.edu/portal/contact-students we are all happy to chat. You should be able to be connected to a student who wants to do the same thing as you from a similar background - which is a great place to start.
(Also, to those who say CBS is not a consulting school like Kellogg (or Booth, hmmmmmm) - just take a look at the numbers. We place just as well, and better into NYC which should tell you something. But since the OP isn't looking for that, he/she should go where the best options for a career are. )
I don't go to Stern so I cannot comment about it.
Finally, about culture, CBS has a great one. We just allow for more types of culture. If you're an introvert, be one! If you're an extrovert and want to go to everything and travel all over the world, there are hundreds of students that want to do that too. It's the best of both worlds, and it's honestly one of my favorite things about the school. And finally, CBS matters is a great thing to take part in - talk to any current student about that. I think you'll find plenty to be involved in at this school, it is all what you put into it anyway.
Hope this helps! Congrats.