Currently, the public must schedule an appointment to conduct business at City Hall, including License Services. Customers may request information, submit drawings, and purchase building permits On-line​ or at the Development Center.There will be a charge per letter, but not for the amount of time devoted to letter preparation. Question - I just filed my N400 in Phoenix via E-filing. The website states it takes about 7.5 months for it to be completed. Fill Out the Application. Ready to apply, visit Permit Center. Issue the Letters of Appointment. Sign the Order to Personal Representative. Instructions on how to do so are included in the application.