Business letter

Please write a one-page letter; the letter should convince someone to do something that will be mutually beneficial to your company ( a guitar shop). For example, let's say that a neighboring business is blocking the alleyway between your two businesses, preventing the delivery people from getting access to your delivery area. Write a letter that demonstrates how it will help both of your companies if the neighbor doesn't block the entrance. 

Please use Times New Roman 12 point font, make the letters one-page in length, and use modified block formatting.