Recipient's Address in a Business Letter

Ms/Miss/Mrs/Mr/Dr …
house number, street
place
area code
COUNTRY (in capital letters)

In American English, the area code is usually at the same level as the place, separated by a comma.

Position: on the left

British English

In British English, the recipient's address starts on the same line as the date or one line below the date.

American English

In American English, the recipient's address starts two lines below the sender's address (or two lines below the date if the sender's address isn't placed in the top left corner).