More than 30 states have disclosure laws requiring sellers to tell prospective buyers and buyer brokers about leaky roofs and other problems, according to the National Association of Realtors. But there’s often a gray area involving the disclosure of problems the seller may not know about, such as a long-ago flood or hidden mold.

States are also increasingly passing laws requiring homeowners to disclose environmental issues, such as the presence of radon gas, a contaminant linked to lung cancer, and underground fuel tanks. In California, the checklist of required disclosures is so long that a cottage industry has sprung up of firms that help sellers prepare the forms.

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What other forms of protection does an Exclusive Buyer Agency (brokers who specialize in representing the buyer) provide?