Real Estate Law
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Well lets focus on the foreclosure first? Does your agreement with him contain a "power of sale" clause where you pre-authorize him to take the property if you default? If not, then he needs to go to court to foreclose and it will take some time.
As to the down payment he promised, unless this is in writing somewhere, it is not enforceable. If it is in writing, he may be able to get out of it due to the default, but I would need to review the contract. Can you upload it?
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