I’ve gotten quotes ranging from $6,500-$12k to repair and waterproof the exterior walls, plus there's the added cost of repairing and repainting the inside walls.

Removing non-load-bearing walls to create a more open and spacious floor plan can significantly enhance the appeal of a property.

We recently discovered mold showing up in the basement walls.

Also just replaced carpet and painted the walls because there was water intrusion from heavy rainfall.

Your build out cost will be less competitive for the elevator systems, fire sprinklers, exterior parking spots- unless you do drive through load zones, and exterior wall surface.e. 

If they put a hole in a wall fix it as face as possible and let them know it's not okay, but accidents do happen.

Our total gut ran about $65k inculding all new drywall as the walls had an adobe style finish, plus we added two additional 1/2 baths.

a toddler is going to grab a sharpie and have at your walls LOL.. 

Quote from @Jaron Walling: This market has rental properties in a gridlock. 

This house was very nice and clean (build later 1980) My tenant recently claimed there is mold on 1fl (it is like basement as there is no window, it is next to garage) When i see, the mold is not only one area but it seems widely spread on the ground floor (laundry room, wall, celiling etc) Since it is OOO investment, it is not easy to deal with mold issue.