I am a beginning investor with a single, two unit property. I would like to continue to buy as I find the right deals. I am mostly interested in buy and hold rentals. When, if at all, is it advisable to create an LLC in order to reduce my personal liability? 3 doors? 10? Maybe it is not necessary at all?
Whenever you want, but probably not for a while. If you had significant equity it might be more important, but guessing you are into it for a down payment. Have adequate liability insurance and spread the cost of a liability umbrella across a few properties before you take on added administrative load and cost.