Data on commission rates in Commercial Real Estate - Office Transactions
I am doing an analysis of commission rates for sale and lease transactions of Commercial Real Estate Office Asset class in the United States. 

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Does any have an idea on a good place to start looking for this kind of data? 
[{"id": "ehz5ho4", "text": "You aren't going to find much. \n\nIt's against the law for there to be such a data base at least made by brokers themselves. Brokers cant talk to other brokers about what they charge etc, cant collude on what to charge. Anti trust laws. ", "replies": [{"id": "ei1v1ms", "text": "Never heard of that law...\nYou should contact the large brokerage houses or brokers for the data - they should at least be able to give you range of fees by size. ", "replies": [{"id": "ei1v8p9", "text": "Ya you can call each broker and ask them what thier fees are sure. \n\nBut brokers themselves cant talk together about what fees each other offers. Or have any sort of data base tracking such. If a third party makes it sure but it will never stay up to date. ", "replies": [{"id": "ei3d969", "text": "Many times the commission rate is tailored to the deal...", "replies": [{"id": "ei3dtpn", "text": "For sure, another reason why you will have trouble gathering this info ", "replies": [], "depth": 5}], "depth": 4}], "depth": 3}], "depth": 2}], "depth": 1}]