We do a pretty good deal of site selection with data behind it and use experian as a data source. 

It won't be as much death benefit as you have now, but it's better than losing the money completely.  

For something more robust, tools like Excel or online calculators from financial planning sites might better suit your needs.Your ROI Formula:ROI = (Net Cash Flow ÷ Total Out-of-Pocket Investment) × 100For your scenario:Net Cash Flow = Annual Rental Income - (Mortgage Payment + 401k Loan Payment + Other Expenses)Total Out-of-Pocket Investment = $40,000 cash + $50,000 loan payments over 5 years.I came across a piece in Bloomberg recently discussing creative financing, and they touched on ROI calculations for multiple loans.Personal anecdote: A buddy of mine leveraged a 401k loan for a fourplex.

Hi All,  just heard about this site. 

Another thing is, the sites that list the manufacture year showed that all the ones I was looking at were built in the 70s.

Where is your site at? 

If you have a tenant that doesn't pay and you have to evict, you might lose 3 to 5 months of rent payments plus have make ready costs of 5k to 6k depending on what they do.   

I'm having a hard time finding any estimating tools for this kind of a project, adding a story and multiple BR/1 BA, and wondered if there were any tools, sites or recommendations any of you have for this kind of a project. 

If you can't close fast enough or has too much red tape, then you lose the deal to others.

I'd like to not "find out the hard way" if one of these sites are not a good match for me.The ones I'm considering are Propstream, Property Radar, ListSource, and PropwireSomething to note, I am looking to return to doing some wholesale deals, using criteria such as absentee owner, out of state owner, tax delinquent, vacant, liens, and pre-foreclosure..