I am contemplating getting my Bachelors Degree in Bachelor of Science in Nuclear Engineering Technology in order to exhaust my GI Bill.

That means you notify the tenant - in writing - that they are responsible for the full term of the lease or until a replacement tenant takes over, whichever occurs first.

Did the walk through today and now the floor tile and under floor will need to be replaced in one room. 

I'd replace that too.My question has to with whether or not I can do this without asking anyone for permission. 

How about recording an easement on the property to you and others acting on your behalf for access to and from the billboard and use of the billboard, including maintenance, repairs, replacement as needed? 

Do it when the tenant isn't looking so that they can't remove and replace the trap with a clean one. 

We're replacing the roof, adding HVAC, re-siding, paint, trim, cabinets etc..

I'm thinking about leaving the windows that don't show signs of rot, and replacing all of the windows on the front of the building (these all have rot present).  

I worked for granite fabricators for years and yes there are small traces of radon but we felt it was a selling point to turn the industry to quartz which is an engineered stone that doesn’t require to be sealed.

Even if someone knocked it down and replaced it with a brand new structure, the neighborhood layout is aweful and all of the surrounding homes are on top of each other, no privacy, not so much as a tree for as far as the eye can see.