This form provides authorization for certain individuals to apply or sign for permits under the contractor's license number. A Delegation of Authority letter is used to authenticate other authorized signers.This Authorization Letter gives the owner of the letter the right to act on another person's behalf. This form serves as a letter of authorization for contractors in Largo, Florida. 306 East Jackson Street Tampa, Florida 33602 This will serve as authorization for. of. 900 South Fremont Ave, 3rd FL. Alhambra, CA 91803. This dynamic PDF is not fillable if you open it in your internet browser. Please use these steps to download, save, and fill out the form. It's important to start the authorization letter in the Word format of the business letter.