Original Chanote
Original Tambien Baan (blue book)
Your passport so the land office can verify your identity as company director
Your company stamp, which will be needed along with your signature on the documents at the land office
You should have updated company documents showing that the company is still a valid company and that you are still director authorized to sign on behalf of the company
30,000 baht in cash that the new buyer will return to the existing tenant at the end of the lease
A copy of the original lease between you and the tenant