You have HOA rules, You have city ordinances... now pay for a CO? The definition of a CO relates to New Construction. Its just another fee that has to be paid, causing problems between the seller and the buyer... Think about it... is someone is ready to close on a home and the house fails, who's responsibility is it... the sellers or the buyers? Just think if you bought the home, it fails, you cannot back out... you are basically screwed...plus this is hurting realtors.