@NA Miller Taxes can definitely "be so high in a particular area it's completely infeasible to turn a profit off a rental home" but you can't change that and you can always count on them going up over time.
What size/configuration are each of the units and is this in a nice area in West Chester? $3200 monthly rent on a 4 unit seems kinda low for West Chester based on what I've seen recently. $800/unit would rent out very quickly though.
Also, I think you're closing cost estimate is very low. Is this an actual number from a lender?
West Chester is tough as it is very competitive and the prices don't always make sense for cash-flow rentals in this market. In my observations, a lot of well off people in the area seem to use these investments for tax reductions and not cash flow investments, making the cash flow properties even harder to find as prices are inflated by that demand and they could care less about positive cash flow.
If you can boost rents to 1% or more of the purchase price as @Rich O'Neill suggests, you'll find its probably much closer to a worthwhile investment. I do think you're going to have a tough time finding 12% ROI on a multi-unit in West Chester any time soon. That said, I think West Chester is a good market and a lower ROI can still make sense depending on your strategy and ultimate goal.
Cheers