Which of the following is NOT among the most commonly used real estate forms?

Building permits are typically not classified as commonly used real estate forms because they serve a different purpose in the realm of real estate transactions. Building permits are issued by local government agencies and are required for construction or renovation projects to ensure compliance with zoning and safety regulations. While they are crucial for the development or alteration of properties, they do not directly pertain to the typical contractual agreements or disclosures that real estate professionals and parties to real estate transactions regularly engage with.

On the other hand, sales and purchase contract addendums, listing contracts, and seller's property disclosures are essential forms that facilitate the buying, selling, and disclosure processes in real estate transactions. Each of these forms serves specific functions: addendums modify existing contracts; listing contracts outline the agreement between a seller and a real estate agent; and seller's property disclosures provide buyers with important information about the property's condition. Their frequent use in real estate transactions contrasts sharply with the function of building permits.