@Patrick Barker
We really need more info to give a good assessment of you deal.
1. What is his current data; rent, vacancy rate, other expenses, and NOI. Current cash flow? How much equity in properties? Any rehab required?
2. Here's my quick analysis based on info you have provided:
Income = $86,000 ($600 * 12 units * 12 months)
Expense = ? (50%) $43,000
NOI = $86,000 - $43,000 = $43,000
Value = $43,000 /.10 Cap Rate = $432,000 (his price is $462,000)
3. What Minimum Cash Flow are you looking for? $200 per mo. per unit. Then your Mortgage payment would have to be $1,200 or less based on my ruff analysis above. Even if you put 25% ($115,500) down with a 5% APR 30 note your payments would be about $1,860 per month.
I'm not trying to dissuade you from this deal. Just saying need more info.
Other than that you might try to get 2 or 3 verses all 6. Also, if Seller has a lot of equity you might see if they are interested in Seller financing.
Keep digging. :)