If the PM is good, they'll have no trouble supplying some names and numbers for you to call.If you can find a a good PM, they'll be worth their weight in gold.

The appraiser will put the most weight on the income approach and determine the value by capitalizing the NOI. 

I would look to target lighter rehabs in the range of 20-40k.  

If it's not a one-off homeowner selling their one little house once in their lifetime, tread lighter on the heavy-handed negotiation tactics. 

We requested a 60 day close on the offer and that the seller serves 2 months eviction notice (even though this may not of held much weight legally because it was a fourplex).

It is best working with a modular factory that builds using SIP Panels as they are more energy efficient and lighter weight with a much stronger quality, the SIP Panels can be worked with using OSB or Phenolic Skins. 

Worth his weight in gold!

Triple Net leases are worth their weight in gold.

If the seller just needs cash, then an all cash offer at a lower price point will carry the most weight.

If the duplexes are adjacent to one another and the total amount of units is over 5 than the lender would most likely have a commercial appraisal done weighted mostly towards the income approach value.