Missing doors, damaged cabinets in kitchen, damaged vanity in bathrooms, replace the flooring and subflooring in the entire house, fix some holes, replace appliances. 

It is hard to find the right one that are willing to guide to the path because without it, can lead you to a big hole.

The slab is sloped towards a hole with a sump pump in case any water gets in however it won't have much get in as they put in the piers on top of the slab and then put in walls and seal the whole thing.

All he had to do was measure and cut a hole (which he ended up doing anyway) like it's done with all plumbing when installing cabinets.3) needed to add power the new ceiling lights in the kitchen, so the geniuses removed the dedicated computer outlet, rerouted the computer outlet to an old fuse box that supplies 1/2 the power to the house (don't ask me why, I moved into the house with1/2 fuse 1/2 circuit panel).

I do it all the time to houses that have never had central HVAC and don't have any duct work.You can control the temp in the house from one location and even add a programmable Wi-Fi thermostat for remote monitoring and control.You won't be cutting holes in the side of the house and making it look like a hotel instead of a nice house.This will increase your resale value over the other options.Mini splits and window AC units look ghetto to me, so I spend the money to do it correctly.

A hinge can come loose from normal wear and tear after a year or two or ten if the hinge wears out or the screw hole wallows out. 

A turnover, an eviction you are in a hole.

Quote from @Stacy McGee: OK, you were receptive to my advice, even though I come across as an a-hole.

If you have a hole this big, you probably have a dozen more you haven't even discovered yet.

Please feel free to check out my profile for more details on the investment, but we were able to spend 1 year slowly renovating the apartments as tenants moved in and out, invested heavily into leasehold improvements (long-term fixed like HVAC, water heaters, exterior paint, property drainage, etc), converted month-to-month tenants to annual leases, and raised rents to market.