You have to disclose everything that is wrong with your property to the potential buyer of your home.
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If you don't, and the buyer finds out you were hiding something, prepare for a lawsuit.
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The easy way to disclose what is wrong with your property is to fill out a "Seller Property Questionnaire".
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This 4 page form asks you questions about defects to your property and allows you you to explain in detail what the defects are.
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By telling the buyer up front what is wrong with your property, you avoid a major headache... and lawsuit.