The sun will destroy any roofing product long before rain and snow. 

That's why I was hoping there was a way to pretreat baseboards to prevent serious problems before they destroyed everything.

Also the city likes to pick on the landlords of these properties that the tenants destroy to make themselves look good in front of the camera.    

I love cats but a peeing cat can destroy everything.

(that was the family of 6) They completely destroyed the carpet and walls in the spare rooms.

If this women has been paying rent and not destroying the house, why does it matter how often the man she sleeps with spends the night?  

Between the urine, hair, and claw sharpening on all the woodwork they can really destroy a place.I would probably pass if your main plan is to put a highly allergic person in it, but if the numbers work out well and you can rent it to an animal lover it might not be a bad deal.

Those are areas with solid schools and good rental rates, but the home prices don't destroy your margins for buy & hold. 

@Steve Babiak Thanks I had some idea there were panels and drop ceiling stuff we could install but it would likely  destroy the character of the apartment and I doubt the downstairs tenant would want it even if I offered to do it. 

Yes, capex like new roof, HVAC, and water heater can really destroy all previous cash flows.