Starting 1.30.1 theme version we have added the feature to be able to assign a property to more than one agent.

The feature is made for back-end only.  The admin will be able to assign the agents to the property from Agent section in Property Details:

You can select more agents with CTRL.  To reset the selection, choose NONE and save.

If you have more than one agents selected, the email from contact form will go to all agents.

On the property page you will see the main agent and the secondary ones