Hi Matt,
I am guessing at that price, the 4plex is in the Bay Area? Got to love the Bay Area prices! Many in here won't believe the prices but I live in Northern CA so I understand. How much rent are you getting for the 3 units that will be rentals? It sounds like you may be getting into a very tight situation. I am assuming the fourplex is rented? How do you know the tenants will pay rent the first month you buy it, or if one may leave? I can tell you all kinds of stories of things that have happened to me. If you don't have any staying power with funds, what are you going to do? What if something major breaks right after you buy it? Your funds sound very tight. 13K is what you are guessing you will be getting if all three tenants stay and actually pay rent for first 3 month, is that correct? I can tell you that a lot can go wrong here unless I am missing something that you have outlined. I don't mean to be negative, but from what you have written here, it sounds like you could get yourself into some trouble. If you are that tight on funds, please consider the deal carefully. Do you own other rental property or would this be your first? If the agent has given you some type of pro forma or cash flow/cap rate anaylsis, I would be interested in hearing what they are telling you.
To answer you question about the 13K, it would be tough to answer until knowing more about the deal per above. Do you have any other funds besides the down payment?