Giving notice in writing of an intention to sell property legally means simply informing the other party of your plan to sell. It does not automatically grant permission. However, the recipient can act on this notice if they have an interest, and their silence until the notice expires can be considered deemed permission. Letters of Intent (LOIs) are often used before a final contract to outline key terms and show commitment, but they generally don't legally bind parties to a sale unless specific clauses like confidentiality are agreed upon.