If no, are there photos of each unit and all closets, the basement, the roof, the exterior, and all mechanicals?

a property that was attached but the next door property had a door to the roof of it with a deck. 

Basements (if they have them), roof, attic, crawlspace, exterior, and all mechanicals are where all the unseen costs are not in the kitchen, bathroom, etc.

You asked about buying older properties and the biggest issues I have found is that roofs need to be replaced, HVAC needs servicing/replaced, and sometimes there are foundational issues (not super common). 

I live in Georgia and the hurricane destroyed the roof.

As Hurricane Helena went by, both of the roofs got damaged.

If they have a good roof, I use a company that used to send someone out to do a roof inspection (at no cost to me). 

And in some cases, a roof inspection when the HI is not confident or the roof is a specialty roof (metal or tile) 

If a major expense comes about (i.e. roofing repair, hvac, etc) we would split that as well. 

Capex is usually lower, around 2-5%, since major replacements like roofs or HVAC systems are far off.