Texas Property Code - PROP § 29.0035. Demand to Unknown Defendant

If the address or identity of the defendant is unknown, the demand of the petitioner for reimbursement from the defendant required by Section 29.003(2) may be met by publication in a newspaper in the county in which the property is located once each week for four consecutive weeks, with the final publication occurring not later than the 30th day before the date on which the petition is filed.  The publication must contain the demand for reimbursement and: