you could also mess around with budget settings, like for example, say you have a health index of 200, drop budget to 75%, and your index drops, without destruction of hospitals (which you will need, if you ever plan on adding pop, or playing for a while). You can always up the budget later on, and since there's no "maintenance" of buildings per se (that I can find), having a hospital run at 10%, and then run at 100% makes no difference to the actual state of the hospital - what I'm saying is, in case I've got it wrong - is that if you neglect your health department for a while, you will not incur costs (other than what is the base line required) at a later time, when you decide to re-use them. Just make sure you have enough staff to be at each hospital - cuz no staff == no hospital.