When they  stop supporting a particular version, generally after two years, you can no longer download transactions from your bank or credit card, necessitating an upgrade.  

I want to calculate for reinstatement (and modification) and for foreclosure (and deed in lieu). 

Due to the size of these stores it makes it very difficult to rent these locations and in most centers you have to divide the space which requires significant modifications to hvac, electrical, plumbing and storefronts.While this doesn’t answer the questions gives things to consider if buying one.

Any thoughts on my idea / modifications I could make? 

You want to be sure you are buying a legal unit so look for any signs that any modifications, additions etc. have or have not been made then ask your building and planning department again about that particular property mentioning any issue you question such as additions, remodels  or modifications that look suspect to you.

We are upgrading with Luxury Vinyl Plank (LVP) flooring, this is an appraisal point and they last longer than the standard flooring, The extras windows (free), granite countertops because once again it helps with appraisal but also last a long time and they check a box for renters, and a few layout modifications that i believe add more value and let the units work better given the site layout.

For example, touting that you've never done a capital call or given back keys on a property when in the background, you're having to negotiate with current lenders on loan modifications so that you can delay capital calls and/or giving back keys.