Bottom line, the agent is correct. Florida Realtors has pre-approved and standardized a few different formats of the listing agreement that we can go ahead and use both for sale.You will need to fill out a modification of terms form(MT). There's an area for the listing price. Contract Formation: A listing agreement is a contract for services. It is not required to be in writing in order for it to be enforceable. To the clause number in the addendum. For example, "This sentence modifies Paragraph _____ of the. Agreement. No… They have to fill out the counteroffer as protocol. Florida REALTORS® makes no representation as to the legal validity or adequacy of any provision of this form in any specific transaction.