3 fourplex houses, This would be my first deal. Please help!!

There are 3 fourplex houses, with separate tax ids.  They are listed at 300k a piece. I contacted the listing agent, she stated that the seller is willing to sell @ bundled price. She did not state how big of discount, I'd figure 825000-850000. All units are rented, 12 units renting for 700 a piece.  totaling 8400 gross income.  They were built in 1972, and they are fully rented. I figured with 20 percent down it is about 170000. I need some ways to come up with that down payment. Buying with Terms are out of question.