How to get out of contract after 4 months of not closing?

[Serge Suchkov]

Hello, I am looking for some legal help here. The situation is this, I have been in contract since the end of December. The seller has not kept their end of the deal (they were supposed to evict a tenant and remove an underground oil tank). The contract does not specify when, as the buyer, I can pull out of the deal. How long can this go on? I am stuck in a weird limbo where I cannot close or walk away. Is there a way for me to get out of this deal and get my earnest money back? I am in NJ. Thanks, S