What is the average spread in the market(s) you are in for flips?

I am subletting a property that I am planning on purchasing the set up where instead of any type of security deposit I am re-having the property which is necessary before I rent it out.I will have about $20,000 in expenses all before I purchased the property.

Expect them to be expensive, also.  

But ya have to make some educated prognostications in life.Add this to the information your processing - What your talking about doing is eliminating around $4000 or interest expense (which is deductible anyway so really could be a real impact of eliminating $2800 or so) of debt in exchange for paying over $10K in capital gains tax (don't forget possible state gains tax as well).  

You likely only made a down payment of 3-20% ....but you still get to write it off on the full value across 27.5 years.So 400k/27.5 = 14,000 ish a year of a write off where during the year you didn't need to incur an actual expense, no cash outflow. 

And a deal in my opinion is one that will 1. pay for itself(All property expenses) and 2. pay the debt service(if necessary) and 3. put money into my pocket each month.  

If you are setting aside funds for capex, taxes, insurance, or other expenses that don't occur monthly, transfer those funds to Savings each month and hold them there until it's time to spend them.

The paid off student rental plus the 2nd student rental helps pays off the mortage for 2nd student rentals and living expenses for me and my wife. the duplex was  cash flowing approx  $300 month with the old tenants We manage everything ourselves with some help from our family. 

We’re fortunate to have an above-average income and live well below our means.This summer, we’ll be moving to Detroit (PCSing in August), and we’ve saved about $120,000 to invest in addition to having funds set aside for the home we’ll purchase in Detroit.The reason I’m posting is that I’m struggling to decide how to best allocate the $120k.

@Jordan Miller - I think to give proper guidance it would be good to share more details on the revenues and expenses on the property.