Repaired windows.

A few common items to be on the lookout for:  Look everywhere inside and out for peeling or missing paint and fix as necessary, test windows to make sure they open, can stay open, close, and lock (old wood windows may have problems doing this regularly or be stuck all together), review basement for any signs of standard black, non-toxic mold/standing water, make sure all stairs are cleared of tenant items (no bikes, boxes, etc.).   

It was an open vaulted ceiling with floor to ceiling windows on a slab.Normally this wouldn't have been a problem, except in this house the owner had some electrical issues and decided to take the cheap way out to repair it by running all the wiring outside the walls in channels like you would find in an industrial application.

Window units might work if security is not a concern.

I have been through replacing a roof, an eviction (where the tenant came back to break all the windows in the house), replacing sewer pipes, and several other issues that I am sure you guys would identify with. 

There is also significant damage that can happen from mowing the yard such as rocks being thrown by the mower and breaking windows etc., and if you take responsibility for it, then you take responsibility for all of it.

Now all of my brand new baseboards, door frames, and window frames have paint strokes, caulk drips, clumps, etc.

The property does need some repairs/updating (windows, refinish floors,new roof, etc) but its mostly cosmetic. 

@Caleb Bryant, yup - new roofs, windows, fencing.

People within that 2 or 3 month window, it's more like 70%, if I start deleting that more recent data, then I screwed up b/c there's about a 70% chance I would otherwise have actually used that information to help someone buy a home.