for a fast and loose number I use finestexpert.com it is a free tool and gives useful comparable quickly. 

I would also find some boots on the ground.

You can have all the parts of the plane in front of you, but if you never learned how to put them together you will hit the ground before you learn. 

A local realtor can run a CMA (comparative market analysis...

MY tenant  met the new owner while walking the grounds.  

Need to work with a local - boots ont he ground - wholesaler.

I think the only thing that would be comparible is maybe the military.

If someone has spent 2x the amount of time (compared to the alternative) and have been awful all the time, then they are twice as awful as your alternative. 

After Repair Value /Comps - Provide comparable sales data that confirms your After Repair ValueRepairs - Provide a detailed estimate/scope of work of the repairs that you are planning for the project.Loan Terms - Provide the financing terms (interest rate, points, holding period) you have budgeted to pay the lenderHolding Period - # of months it will take to rehab & resell the propertyOther Costs - Provide a breakdown of other costs (buying, holding, selling & financing costs) Profit Margin - Highlight the total profit & profit % you have built in the deal.  

I am just going to choose about 10 homes from the BidBaltimore.com website and compare those to the new list.