What are the requirements for renewing a Non-O visa extension in Thailand, especially regarding bank statements and lease agreements?

The post discusses the requirements for renewing a Non-O visa extension at the Chang Watana office in Thailand, specifically related to bank statements, proof of funds, and lease agreements. Key points include confirmation that a bank letter updated on the application day is necessary, the requirement of having proof of 400,000 THB only at specific times, and the possibility of using a copy of the lease agreement instead of the original. Additional comments note that a TM30 form receipt and potential need for a copy of the owner's housebook may also be necessary.