It would be a violation of the REALTOR code of ethics and usually state statute or department of real estate rules for a broker to subject a client to paying a dual commission. If you have an exclusive right to sell agreement with your current broker, you may at your option additionally list your property with a commercial broker, however, you would still be contractually obligated to pay the residential broker and give notice to both brokers that you are aware and consent to a dual commission should either broker sell the property. However, if the commercial broker is willing to sign a listing agreement that precludes your obligation to pay the commercial broker should the residential broker procure a buyer, then you could avoid the paying a double commission in that regard. Should you wish to cancel the contract with your current broker, I would consult a local competent and experienced real estate attorney so that you may fully comprehend your limits and obligations under the contact.
Jan 31, 2017