Hi Paul,
Since you have no contractual agreement with the real estate agent and I doubt the real estate agent had anything to do with deciding to do or not do the renovations I would say no, you have no recourse against the real estate agent.
The landlord on the other hand, perhaps. The law states that a 60 day notice to vacate can be given to a tenant if renovations or repairs are to be carried out and they cannot be carried out with the tenant living there. I am not sure whether the requirement to perform the renovations can be enforced at law or not.
I would contact Consumer Affairs in VIC and speak to them about your options.