@Greg Heden
If the money is from a cash out refinance then you are likely paying higher than a 5% interest rate on the money, so you would be losing money if you just leave it in a MM account.
ConC return is not a very good measure of a real estate investment (unless you are investing in class C/D and it sounds like you are not), as you mentioned you will also be getting tax benefits from depreciation and those benefits will be at a high rate because of your tax bracket, so I would try to calculate that and quantify it. Also, if you are investing in a great area then you should calculate some sort of appreciation in property value and rent growth, somewhere between 2-5%. It sounds like you might not need the cash flow to be positive because you have other forms of income to support your overall cash flow, but if you really feel you must have positive cash flow then you could just put 40-50% down and then do a cash out refinance in a few years when rates drop and values and rents are higher.