No Solar stuff, No Ham Radio antennas, No Flag poles, etc...If it were me, (to be tactful) I'd tell them it seemed like a good idea but my attorney advised against it, and leave it at that.That way you are not getting in to any kind  of perceived Political or environmental disagreement with them, and you remain the innocent middle man.Just my 2 cents.Good Luck!

They may be just looking to diversify their portfolio, a tax offset, or a perceived safe store of money.

Value is always perceived in the holder of taker of the value. 

Accept you cannot know everything, buy the property anyway, make mistakes like all first timers do, and learn from your mistakes.Learn what you can, but don't allow a perceived lack of knowledge to stop you from proceeding. 

More perceived risk in smaller properties because location and tenant base is not usually that strong.

The end buyer did very well as we did not get a lot of showings, and they were able to make a massive profit despite the perceived risks.

They would not have done this if they perceived our ability to manage as an added risk.

It's not perceived any differently than if someone tried calling them and had to leave a message. 

PM me if you want an example.4) Think about how long the tenant has been in the property (and how they will perceive your changes), when I bought a property with tenants that had lived there for 8 years - they certainly felt as if the property was theirs to do as they pleased, long story short - the changes I made to both rent and expectations of non-unit areas upset them greatly and it was best to just end their lease and let them move somewhere else.Happy to help further if you have specifics!

I did consider offering a second, but I wasn't sure how that would be perceived by the lender(s).