The return address should be written in the top right-hand corner of a formal letter. A formal letter follows a specific format and uses formal English language.Keep reading to find out how to write formal letters. Citing a letter, memo, or other correspondence ; A print letter ; Note. 1. Charles Hanson to Nancy McPhaul, August 22, 2008. Template documents set up in Chicago style are available to download below. This resource covers the parts of the basic business letter and provides three sample business letters. In accordance with Section of 17-13-0107-A of the Chicago Zoning Ordinance, Title 17 of the Municipal. Use a formal greeting to begin your letter, not a first name. Most greetings should use "Dear" for the salutation.