And what do you think are unreasonable expectations from the owners or wish would be different?

I dont think I was unreasonable with a $40 increase. 

I have stopped answering phone calls and resorted only to written communication (for my records) but have noticed a pattern of very emotional and aggressive behavior from this tenant (as well as extremely unreasonable expectations about what the timeline is to have something fixed).

It sounds like an unreasonable seller, and it seems you have given him some viable solutions but he just isnt interested. 

It seems unreasonable to pay $800-$1500 for fees to the seller’s closing agency even when you are selecting your own.

I will tell them to meet me on site if the price seems unreasonable, and they know this now so its always been unnecessary.   5- do you mind sharing their fees and structure?

And 30 year amort is not unreasonable.

I don't think the price you are getting is unreasonable.

Sometimes honest clients are unreasonable too.

Also tell them during contract signing if the price of the change order seems unreasonable it will go out for bid.It might go a long way to let them know you're looking to build a relationship with a company for all future work and that relationship will be dependent on quality work, reliability and FAIR pricing.