If you have entered into a contract, you must stick to what you have agreed to do, the purpose of the termination letter is to issue a clear and concise invitation to terminate the business relationship between you and the company, without leaving room for misinterpretations. It is apparent from the content of the agreement that you have now posted that it is in no way an agreement to sell the property. These contents are the conditions that the seller undertakes to respect. 1) It seems that you have designed the contract 1) the contract is completely silent on the consideration to be paid You can terminate the contract by indicating to the buyer that you are no longer interested in selling the property, since he has so far not paid in advance for the purchase consideration. . . .