1 Tex. Admin. Code § 79.28
The registered office address of a corporation or limited liability company must include a street or building address for purposes of providing the public with notice of the physical street location at which process may be served on the registered agent; a post office box alone is not a sufficient address for the registered office. The address of a commercial business which provides "private mail box" services is not sufficient as a registered office address, unless the commercial enterprise is the business of the designated registered agent. If the registered office address is in a city with a population of less than 5,000, the secretary of state will accept an address other than a street address for the registered office.
Source Note:The provisions of this §79.28 adopted to be effective February 18, 1998, 23 TexReg 1528.