A: No. However, any written brokerage contract must contain a statement in which the brokerage policy is open to the cooperation and indemnification of other brokers, including whether the broker intends to share the remuneration with other brokers. Accurate commission allocations are not necessary. (193E-11.3 (1)) Radon Disclosure Fact Sheet – Not necessary, but there is a section on disclosing the seller`s ownership conditions that refers to radon. This is an issue to be taken seriously in Iowa, and it is recommended that all new buyers have the necessary tests done to relieve this threat. Agency Disclosure Form (193E – 12.2 (543B) (3)) – A document that identifies the party or parties represented by the agent in the real estate transaction. .