Tex. Finance Code § 182.203

(a) A state trust company may establish and maintain additional offices. To establish an additional office, the state trust company must file a written notice with the banking commissioner setting forth the name of the state trust company, the street address of the proposed additional office, a description of the activities proposed to be conducted at the additional office, and a copy of the resolution adopted by the board authorizing the additional office.

(b) A state trust company may not commence business at the additional office before the 31st day after the date the banking commissioner receives the notice, unless the banking commissioner specifies an earlier or later date. The banking commissioner may specify a later date on a determination that the written notice raises issues that require additional information or additional time for analysis. If a later date is specified, the state trust company may establish the additional office only on prior written approval by the banking commissioner. The banking commissioner may deny permission to establish an additional office of the state trust company if the banking commissioner has a significant supervisory or regulatory concern regarding the proposed additional office, the applicant, or an affiliate.