Final answer:
The sender's return address is not included in the body of a business letter if it's already featured in the letterhead.
Step-by-step explanation:
The type of address that is not typically included in the body of a business letter when it is already featured in the letterhead is the sender's address. In business correspondence, the standard format includes various elements such as the sender's address, date, inside address, greeting, body, closing, signature, and the sender's typed name. When a company's letterhead, which often contains the company's address, logo, and other contact information, is used, the sender's return address does not need to be repeated in the body of the letter. Instead, the letter can immediately proceed with the date and inside address.