I wish there was a tool which can look into age/condition of the house, locality, demographics etc. and predict all the cost components such as vacancy, maintenance with a high confidence.

I created a shared spreadsheet he would fill in weekly with his crew’s time worked and what component of rehab they completed during that time so I could itemize charges on the bookkeeping end.

@Yonah WeissI understand numbers too, and I've been having this same discussion recently in regards to timing, tempo, DSCR, and cash reserves.I try not to look at it statically with one deal.For DTDMS, I think that there is a physical, spiritual, and emotional component too. 

I literally had one inspector just walk around the property and name property components...

There are other factors that I would consider:size of buildinglength of leases, how long till expirationis seller also the tenanthow long as current owner owned propertywho pays utilitiesis there adequate off street parkingis the current use conforming to zoningany code/zoning issuesage of buildingcondition of buildingrecent improvementsage of key components, roof, heating, plumbing electrical servicewho pays utilitieshow successful is the business tenant's business, are they strugglingif commercial goes dark, how difficult to replaceDavid Krulac

Once I have the property under contract I will have an inspection completed to identify any deficiencies and determine the useful life expectancy of major components/appliances.  

But my point is there's usually a value add component.

Purchase price: $620,000 Cash invested: $72,000 $30k reno on an acquisition we created our own comp on by selling the home next door at $702k.

Sometimes it can all be done with one lender; sometimes lenders partner with one providing the construction component and then the other filling in with the mortgage.

Hopefully for your sake there is a value add component to this deal.