If you get a no on any of these questions, you are probably not dealing with a true turn key... and they will not have enough skin in the game to do a good job for you. 

I am not a contractor, and have no experience estimating those costs. 

On the other hand, flipping is considered a trader business and taxed at one of the highest rates.I have a feeling this is a no-brainer decision when you factor that in. 

I have a house, no kids, good income, no debt.

Tenants have been a little bit of a litter bug leave before belongings and leaving personal belongings like it's storage what would be the best way to approach them about and enforce to keep clean and no personal belongings

If he says no, is my only option to back out and lose the earnest money deposit ($6,000) or go forward with the purchase, knowing I'll have a $3,000 - $5,000 bill or more if I decide to do this later?

Kevin, if you live in or near Detroit, it's a no-brainer to invest here IMO.I started buying rentals in the city about 3 years ago and it's been the best financial decision I've ever made.

Progress is slow, because amongst all my properties it's the furthest away and between a full time job and landlording, I can only work on this property on weekends.I have completed re-framing, re-plumbing of drains and supply lines and new electrical rough ins, but property has no finished walls, ceilings, or flooring. 

There's no loophole.

No.