Many real estate agents are unaware that they owe duties to third parties, parties that have not signed any agreements of any kind with them. Especially in the scenario where an agent represents a seller and the buyer has no representation. The general rule of thumb is this, if a third party reasonably relies of the agents representationsfor the intended transaction, the agent owes that third party a duty to make honest represenations.
A case that illustrates this fact is Bango v Holt,  B.C.J. No. 119: in this case, the seller had an agent, the buyer did not, to simplify, the listing said that the propertys duplex permit was renewable when in fact it was not, the court held that the seller's agent had a duty to be honest with the buyer, as the seller's agent professed to have special expertise with revenue generating properties.
The moral of the story is beware, if you claim special expertise in a particular area of real estate and you repesent the seller and the buyer has no agent, you legally owe the buyer the benefit of your professed specialized knowledge.