In addition to Norman's answer, I can add that some agents make a case for collecting on the basis of projected NNN charges as well, since if the lease were a gross lease, rather than NNN, the leasing agent would be collecting on the gross amount and not the net amount. However, this is a tough sale to an owner that wants to pay the least amount possible for the leasing services.
Onwad and Upward!
Rob Baird, firstname.lastname@example.org
May 8, 2012