This is because I'm concerned that even though the things in the house I can see look great things like the electrical, plumbing, or the foundation may need major repair if not immediately relatively soon. 

Tell him you'll give him a call :) This is one of the reasons why we tell tenants they need to vacate the property for any major repairs.  

Central A/C is damaged beyond repair and needed to be replaced, which can't be done economically or with coopperation of the HOA and other neiighboring owners.

- What level of repairs are you willing to do?

For abandoned parks with infrastructure, some lenders may consider them as long as there’s a plan for the rehab and the infrastructure is in good condition or can be repaired.

Repairs were needed and were finished by early december.

Having it solid in a spreadsheet instead of in your head or on notebook paper and playing with the numbers for the repair budget isn't wrong.

Unless there is an emergency situation, take a lot of photos and call your insurance agent before doing any repairs.

We were not able to recover any yard damages due to other damages they had left that needed repair, which empted out their security deposit.

Unless you find a buyer with a very specific criteria who is willing to pay above the typical 70% - repairs.