I know you asked this a while ago, but I've been incredibly busy in this crazy market. There are many questions that need to be answered before a useful answer can be given to your question. How long have you owned your home? How much equity do you currently have? What is your home worth today? What is your credit history? Are you carrying debt? What type of multi-family were you looking to purchase and where? How much did you want to spend? I'd say the first thing to do is to determine what your home is worth, so that you could decide how much you would might be able to rely on as a downpayment, and then to look at possible scenarios from there. Once you know where you currently stand you can make a more informed decision.. That said, if you currently have any car payments or credit card debt use the extra money to get rid of those high-interest items, make sure that your credit is stellar so that you can qualify for the lowest rate and make sure that you are currently paying the lowest rate possible on your current loan, which, hopefully, is not an ARM with a looming balloon payment. Call me at 845-616-6289 or send me an e-mail at firstname.lastname@example.org if if you'd like my help in valuing your current property and I'll come out at your convenience.