House Lease/Purchase Agreement Question?

We've been in this house for 6 months. We paid $2,500 down. Our lease/purchase agreement is for 2 years. However, it was NOT disclosed to us that the house has major water issues and damage. I'm talking standing water. It comes in through the back wall and the roof. And guess what is underneath the... show more We've been in this house for 6 months. We paid $2,500 down. Our lease/purchase agreement is for 2 years. However, it was NOT disclosed to us that the house has major water issues and damage. I'm talking standing water. It comes in through the back wall and the roof. And guess what is underneath the carpet! MOLD, MOLD AND MORE MOLD. Can we legally just walk away from this agreement and let him keep the down payment? I cannot live this way for another year and a half. Thanks in advance for your replys.
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