I know that there are some agents who would like to charge 10% or so to sell vacant land, just due to the difficult market and the amount of time that goes into the work up to the sale.
I wish you the best, and please shop around for someone who you are comfortable with to sell your ground!
What I was saying was..... There is no "standard" commission. Otherwise that would be price fixing and illegal. Everything is negotiable. Yes, for most normal residential properties the commission varies anywhere from 4-6% typically. BUT...this doesn't sound like a normal property. An agent may want to charge a higher commission for various reasons. I'm not familiar with your area so I cannot estimate what 35 acres in Weston CO goes for these days. Is it a luxury horse property that needs to be marketed to people in that niche market? Or on the other hand...maybe the list price isn't high enough to yield a decent commission? The question is, do you want to sell your property, and what are you willing to pay to get it done? Good luck!