Some states require such disclosure. Others don't. I'm not licensed in Tennessee, so I don't know whether it's required in Tennessee. If you were represented by a Realtor in your transaction, check with that Realtor. Otherwise, check with the state Board of Realtors to find out if disclosure is required.
I'm not a lawyer, so what follows is not legal advice. For that, you need a lawyer.
If it is required, then you may have some grounds. You refer to you "down payment." If it was a lease-purchase and you did make a down payment, then it's likely you're on firmer ground than if you just did a lease-option. In a lease-purchase, there actually is a down payment. In a lease-option, there isn't. The upfront money is an option fee, not a down payment. Big difference. And with a lease-option, your option is to walk away at the conclusion of your lease. A lawyer who knows and understands lease-options and lease-purchases can explain that further.
If disclosure isn't required in Tennessee (and, once again, I'm not a lawyer so this isn't legal advice), then your position appears a lot weaker. You can argue that morally or ethically it should have been disclosed, but that's unlikely to get you very far in a legal proceeding. I DO understand where you're coming from and what your concerns are. Unfortunately, that doesn't count for much legally.
You certainly can try to negotiate something with the owner. That might be a full or partial refund of the money you put down. But if Tennessee is a non-disclosure state, then most of the power really rests with the owner. If you used a Realtor to represent you in your negotiations, you can seek the support of that Realtor. And you can always go above the Realtor to the broker.
Hope that helps.