Site Civil and land use planning....I've been in the conversations for major clients that have both pursued an eminent domain against adjacent owners and have had takings due to eminent domain. Agreed with the above that the ROW agent likely went along with you because it kept you from getting your defenses up, and also that there is little to no reason they need to compensate anything here.
That said, keep your emotions out of it and simply respond to his offer with a VERY polite "thank you so much and I'd love to sign this for you today, but there were a few terms we discussed that I think may have been overlooked....those are XXXX". Most people get an aggressive tone and become confrontational, so those that don't really do stand out. There is a remote possibility that he is willing to resend with some items included. I wouldn't get my hopes up as he really has no obligation to, but if he sees a $5K item he can offer and forcing the legal aspect would cost $5K as well, he just might go with path of least resistance...
The other aspect is you should 100% figure out exactly what the cost for you to take care of your items would be. It may be worth trying to get more 'tenant access/compliant' money and just taking care of the encroachments yourself. For the ROW agent that fits with what he's allowed to do better than giving you items that someone else could criticize his agreeing to. You may need to spend every cent they offer on moving things out and back in, but that a small price to pay if after this is done you have your property back in the condition it was when you started.