Need help figuring out these deals

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Ok,

SO I have a freind that calls me and wants me to fly to Detroit to Invest..

Here's the deal he has 20-30 properties that we can buy for 15K fix for another 30 K

We will be Rehabbed at 45K

These rent for $900

The ARV is 90K for this market but resells are bland right now..

Our take is to get 60% LTV BANK loan of 54K at 20 year Am

We will cash flow at about 150 a door per month on the 20 Year note

So 30 of these we will get

9K in pocket * 30 =270K

36 K Networth Increase * 30 = $1180000 Millionaires

150* 30 = 4500 a month cashflow!

What am I not seeing?