I would get two or three estimates on the work, what visable / tangible difference does the power washer, in their professional opinion, think it will accomplish, and how often should it be done?

Wanted to get some rough estimates. 

All 3 business models you mention (wholesaling, flipping, buy & hold) require that you know how to 1) determine value (after repairs), 2) estimate rehab, 3) evaluate a deal from the standpoint of a flipper or buy/hold investor (the customers of wholesalers).  

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.Download BP’s newest book here some good due diligence in Chapter 10.

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.Download BP’s newest book here some good due diligence in Chapter 10.

How can i estimate ARV if seller will not allow me to walk through sue to tenant occupancy?

You can't find them all at the same time anyway  You actually have to start with the first one anywayWhat's wrong with doing one at a time or at least the first one and see how you do with the estimating and the hiring of the contractors and  the Rehabbing and the renting.

If you do decide to move forward with your due diligence than I highly suggest you have at least two mobile home experienced handyman walk through the properties and give you an estimate on the repair work needed.

The agreed upon price is $91,000 with a $40,000 rehab (had my contractor come out and give me an honest estimate with me there, I've used him many times before).

I have had some rentals in the past and have inherited some tenants as I was accumulating properties.