What happens when a cemetery runs out of space?

In some religions you can cremate your dead like Buddhism and Hinduism and in others even if you have to bury your dead you can reuse the grave site once decomposed like in Islam. Is there a similar practice in Judaism or is the grave site permeant? If it is what happens when the site is all full, do you just create a new one, and if so how is that sustainable in the long run? I also have heard that there are buildings that are multistory that act as grave sites, in that case does that violate certain denominations religious teachings? Do different Jewish denominations have different rulings regarding what is acceptable?