My authority includes but is not limited to the hiring and authorizing of agent(s). Contractor's Letter of Authorization.This form provides authorization for certain individuals to apply or sign for permits under the contractor's license number. Address Letter to Appropriate Regulator. Included below are several programs for which Delegation of Authority letters are occasionally needed. Witness my hand and official seal in the county and state stated above on the _____ day of. ______, in the year ______. Any person or firm acting as an agent for the owner of property in Orange County must have a letter of authorization from the owner. Next, authorize the agents who will be allowed to apply for permits. This will serve as authorization for. of.