A Letter of Completion may be issued for minor alterations that do not require a new or amended Certificate of Occupancy. No objection letters are essential when working on a visa application here's everything you need to know about how to write them.The letter will include a declaration that your employer has granted you permission to leave the country without objection for a short business trip. You will likely still need a letter of employment verification, so talk to your HR department. They'll understand NYC rentals.