The legal agreement whereby rent is paid in order to use another man's real estate property is governed by the lease agreement between the parties The laws governing hire of property in Thailand is applied in the same manner if the hirer is a Thai or foreign national. The primary source of laws governing hire of property is the Civil and Commercial Code. The general principles of lease (as a contract) is governed by Title VI Juristic Acts and Book II Obligations and more specifically the Chapter Hire of Property, but the Supreme Court of Thailand gives rules for the exact interpretation of words and sections of the Civil and Commercial Code and therefore lease in Thailand cannot be fully understood without also taking into account specific Supreme Court judgements. You can read the Civil Code but won't be able to fully understand it.