Building Doors

I assume this is the place to go if you need a model of some kind. I'm helping a friend with an RPG and he stumbled across a method of making buildings transparent while you're in them. But to make this more workable, we need some building models with open doors. I mean, it's great if you can enter buildings and all but if your character walks right through closed doors...it will look cheesy.

So I need some building models with open doors. As far as I know, my friend would be happy with just the standard City Building models, only modified so their doors are open or just plain gone. The size would need to be as low as possible. If this isn't the kind of request for this area, let me know and I'll apologize, but either way I'd really appreciate some help on this.

You can alpha the door on the texture for those buidlings.