It can be a good thing to write a contract to you when you make a purchase from one to another. This works in most cases, a written contract, and can prevent future disputes and to reach some level of agreement is not valid without a contract. It is well, therefore, that the agreement is in writing and describing the terms of both the buyer and the vendor's behalf.
The contract should include information about the condition and if there are some of the terms and conditions of sale shall remain valid and what the price is.
For the purchase of real estate must be in a written contract to be written and shall include, inter alia, the purchase price and the date, and be signed by both the buyer and the seller.