The layout of a good business letter is:
Heading ( Head Address) - Sender's Address
Date
Inside Address
Recipient's designation
Recipient's Address
Subject of the letter
salutation ( Dear / Respected)
Body of the letter
1. Precise and compact
2. According to the reader
3. Satisfactory conclusion
Complementary Close
Thanking You
( Yours faithfully/Respected)
Signature of the sender
( details,if any ).