A title insurance company shall own and maintain in the recording district in which its principal office in the state is located a title plant consisting of adequate maps and fully indexed records showing all instruments of record affecting all land within the recording district for a period of at least 25 years immediately before the date a policy of title insurance is issued by the title insurance company. It shall also directly or through its agent own and maintain a comparable title plant for each additional recording district in which it or its agent maintains an office to transact a title insurance business.