My town home is almost completely renovated aside from a few indoor aesthetic changes that need to take place.

Aesthetically speaking, nothing looks uglier to him then a pipe sticking up in the middle of a bunch of sleek panels.

Aesthetics.  

My philosophy is  - who am I to enforce my own aesthetic values on the folks who are intimately involved in the day-to-day use of the property?  

While I prefer the aesthetics of Lamborghini I must admit Ferrari does an important thing much better.

But I've always managed to find insurers.You can cover it with vinyl, but if you have a property with nice bones (say a nice, or even a middle class old Victorian) putting vinyl over it may throw off proportions of any attractive molding the building may have.If it's a property on Munjoy Hill/West End of Portland, you may want to consider remediation, as it would likely pay off in increased value/aesthetics/resale.  

It will buy some goodwill (if you even want to retain this tenant), give you some control over the aesthetics, and it will cost you a lot less than the time it takes to argue with him and write this post does. 

And at least in my experience, vinyl siding has a definite downside visually and aesthetically.

Use of sturdy materials (although not necessarily the most aesthetic) generally works better than spending on lower quality materials which look nicer.

How would the aesthetics of the park (or apartments) affect the value?