I would be careful with only 4 doors to not have huge unreasonable expenses.

Unfortunately, it’s very difficult to obtain, there’s only a 70% recaptured limit (you forgive the last 30%) and many other items that make it unreasonable.

Is it unreasonable to ask for a materials and labor breakdown when asking for quotes?

I don't think it is unreasonable. 

We have artificially raised lots 1 and 4 to unreasonable levels, because we don't want anyone living in front of us or to the side. 

Is this an unreasonable request?

Some more detail and my thought process:1) I could sign a long-term parking lease/agreement (10-years or so) for the 6 spaces so that the potential buyer would have confidence that he would have access to parking.2) I could devise a parking easement (compensated by a higher purchase price) for 6 spaces, but I'm hesitant about the implications down the line should I want to sell the lot/land or redevelop it in some way. 3) I'd rather not deed out a portion of the parking lot as part of the purchase agreement for the buildingAm I being unreasonable or can anyone suggest another solution?

It's not unreasonable to end up with $6800 annual tax bills for a nice property. 

Sometimes if you get a lot of requests that you think are unreasonable you just want to say no to some of them. 

The paperwork also says that consent cannot be unreasonably withheld but I'm not sure the reason I have for wanting to move is an acceptable reason.