Show them the numbers: the purchase price, estimated rehab costs, projected timeline, and potential profit.

Sellers did not allow us to get professionals in to give estimates for a french drain before closing (yes, our red flag we should have walked away with), but agreed to lower closing price.

Just so i can do the preliminary analysis on the propertySecond: I'm finding it difficult to get a clear price estimate of the CapEx's that might be needed.

This includes finding and vetting vendors, following up on estimates and completed work, and making sure turnover is as quick and painless as possible.  

Something to keep in mind as you're estimating project duration and ARV.

Banking on one buyer to purchase a property at $400,000 above the estimated ARV can easily go sideways.

Today I looked on another site pennymac to see the value it said and there was no information for the address of my property but when I added #2 to the address and it was able to come up with an estimate for my property.Do I need to be concerned that these apps are showing my property with the wrong address?

What is your estimated new construction cost of a SFH, or Duplex, or Triplex? 

$60k initial estimate, 71k final costs.

It's a good idea to get an estimate from a contractor to back up your deduction and keep everything transparent for the tenant.