OK, you want to buy a property without putting it in your name, or using an LLC.
Here's the first point: You need a (taxable) entity to purchase a property. So, although you don't need to be an LLC, you do need some sort of business or personal entity.
If you don't want to do that, they I would consider - VERY CAREFULLY - a lease with an option to buy. It would work like this:
A) You agree with the landlord that in return for paying above market rent, you will receive a certain amount of equity in the property, if, and only if, you purchase the property at agreed upon prices. Do this requires a willing seller (difficult), and a considerable amount of thought about how what the building should cost in the future based on your equity stake. This gets harder the longer you try to keep the arrangement.
B) Since initially in the transaction, you are lessees, the ownership problems of spouses and LLC's are not there.
C) The downside in most of these deals is that if you walk away, then you don't typically get your "rent premium" back.
These deals are hard to put together, but they can be good for both sides in certain situations.
I'm not sure if that is what you were asking, regardles, definitely speak w/a real estate atty.