I don't know enough about real estate to know whether you're signing on with a specific agent, and any of the agents working for the same company are all working towards the same goal. Perhaps during the discussions, as you try to establish this relationship with the realtor, that would be covered and it would be part of implied consent. I think you used the word “written”. It would not require that you have a formal agreement with them as to who could e-mail or call or not. I think it could come up in a discussion, and as long as it was understood, then it would be a form of implied consent that we'd ask whether, if our sister company or someone else had places in this area, you'd be interested in hearing about that.
On June 9th, 2009. See this statement in context.