If these are truly exceptional homes for the area (Company CEO/heart surgeon/society entertainment home caliber) maybe approach the top tier realtors in the area & see what you can negotiate.

Unit of comparison could be per door (unit), per Sf, or total property, etc.Not sure if the balance of value between MF and the commercial building but if I couldn't find similar sales I would probably use a combination of both MF and commercial comps- assuming a retail or office space.Income Approach- appraiser will reconstruct the operating statement from market data and then will develop and opinion of the NOI and overall cap rate.

SEller  ( local prominent surgeon would not discount the price to make it feasible..

Just curious in the process of doing these reconstruction flips.

When it comes to reconstruction /replacement  I would appreciate advice from those who know. 

Qualified acquisition costs mean the costs of acquiring, constructing, or reconstructing a residence, including any usual or reasonable settlement, financing, or other closing costs.

Owner of Cosmetic Surgeon Marketer.   

My wife is a surgeon and I have helped her build and acquire several locations.  

Should he re-construct it back to its original plans?

Like the guy who gets in a car crash, tells the amulance driver he's looking for an emergency room with a surgeon who gives discounts because he has multiple broken bones.Sorry, I couldn't resist.Visually all my work is with attorneys.