I'm in CA and the most common LLC-related question I get is "I live in CA, I want to buy properties in other states, what state should I open an LLC in so I can save money?"
I don't know what state you live in, but if you live in CA and own rentals anywhere, you have to have a CA LLC. In CA, you are legally required to have a CA LLC if you are "conducting business in CA". Even if you own a property in TX, you are conducting business in CA because you live here, collect the income here, etc. If you do have a TX LLC just to hold a TX property, you still have to register in CA as a foreign LLC, which still means paying the CA LLC tax. So there's no point in having an out of state LLC in that scenario.
I would imagine other states have similar laws, but I do not know for sure. You should consult a business attorney in your state regarding this. But my point is that it's not as simple as just finding the cheapest LLC state and opening an LLC there just to save money. There are no free lunches man.