Hi, Thank you for your additional information,
Without reviewing the document it is difficult to say whether an Agreement between two parties is an enforcible contract. Therefore, I will give you the requirements of a legally enforciblecontract and you can look for these elements in your Agreement with your friend.
In order to have a contract the following elements must be present:
1. Offer and Acceptance - Seller offers his house for sale, you accepted his offer;
2. Supported by consideration from both sides - Deed to the house from seller in exchange for purchase price from the buyer
3. Contract is for a legal purpose - Here, for the sale of the house
4. Both parties have the legal capacity to enter into a legally binding and enforcible contract.
All these elements are present, therefore, you have a legally enforcible contract. Providing for contingencies does not affect the validity or enforcibility of the contract,
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