The inside address including the name and address of the person or company receiving the letter.
Single spaced, it margins at the left margin form 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 in side address is equal.
however, sometime you may find that it is put at the end of the letter.
this well make the letter less formal and it is always used in a personal business letter.