Explicate what's in it for them.

This transaction is not in the Northern Virginia area as this are demands much higher prices.Frank Gallinelli Thanks for making the idea explicit. I

That is the legal presumption, and obtains unless a specific relationship of either single agent for seller, single agent for buyer, or "no brokerage" relationship is established explicity (with a signed agreement).

Let me be explicit: I have nothing to say about your hypothetical "bro investor".