If you have the cash to buy one unit, why not buy 1 unit first. Then take out a HELOC on the property. You should be able to get about 75% LTV. Then save until you have enough to buy a second unit cash. You said you don’t have a current mortgage. Do you own a home outright. You could borrow against your home with a really good rate currently. If you are a renter, is it possible to live in the unit you purchase? You would be able to get a really good rate on a HELOC.