The rates you quoted are what we pay as well for office space. Given the recent bad economy, maybe those rates will change. I think the problem is that if you negotiate a low rate, the brokers have less incentive to show your space versus a different space that is going to pay them more commission. The thing that sucks is that if you have like a 5 year lease, you will have paid all of the commission up front (unless you can negotiate otherwise) and the tenant could possibly bail on you after year 1. You would have lost all of that money on commission.

All commissions are negotiable. If you feel "ripped of" counter.