For other questions you may have, please contact the Office of the Tax Assessor-Collector at 210-335-2251 for personalized assistance. Agent (Requires a notarized Letter of Agent.) Note: Certificates are only issued in the name of the owner of the property.In general, Texas has very few official legal forms. Section 35-11(a) of the UDC requires that all requests for amendments include a Cost Impact Statement. The Cost Impact Statement should be. Proposals should include, but not be limited to the following information: 1. Bexar County commissioners approved a measure Tuesday to get thousands of people registered to vote via mailers.