Real numbers- purchase 907k,rehab , closing costs, soft costs, 840k, all in 1.747 mil, basis for each unit should be roughly 291kappraisal of each unit minimum 400k , so 2.4 mil if for all 6.I might refi only 4 out of 6, that will cover initial loan amount.

Hre are the key things to knowWhat you are bidding on - often oddball properties that are hard to identify and have little value are auctioned offThe true as is value of the property, The tax assessment can be way higher or way lower than the true as is valueThe local laws and how they affet your total costs and returns

Are there risks or hidden costs I might not be considering?

Many times they will hold back the renovation costs in escrow and release once you’ve shown the renovated unit and leased it.  

Assuming your property is in Utah (like your profile indicates), here's the state law from a basic internet search:In Utah, a tenant who abandons a rental property without notice is liable for the lesser of the following: The rent remaining on the leaseThe rent plus the difference between the fair rental value and the agreed-upon rentThe cost to restore the property to its original conditionThe landlord can also remove the tenant's belongings and sell them if the tenant doesn't claim them within a reasonable time.

Which increases paperwork & costs for little benefit - if any.4) You'll need an entity in the US.You need to discuss all this with a qualified tax professional or attorney.- For our clients, we provide consultations with a tax attorney that handles over 300 foreigners legal & tax needs.

Regionality and competition greatly factors into the cost structure.

My questions is about opportunity cost.

I understand they are planning to to offer recordkeeping and plan document maintenance services to Quest clients with no cost to transition. 

I own several hundred rental units in other states, otherwise I'd join you in helping cover the costs.