The inside address includes the name and address of the person or company receiving the letter. Single spaced, it begins at the left margin from four to six lines below the date line, depending on the length of the letter. If possible, Try also to arrange so that every line of the inside address is equal. However, sometimes you may find that it is put at the end of the letter. This will make he letter less formal and it is always used in a personal business letter.
The order of arrangement for the various elements of the inside address can be compared to a pyramid. On the top line you place the smallest unit (an individual's name). The remaining items progress downward to the largest unit.