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Flat 24, Building 20 (You can write any building no. or flat no.)
Street 27, block 2( Same here)
Los Angeles, America (this I am just writing as an example you may write whatever country and place you want
Dear Sam,
( INTRODUCTORY PASSAGE )
I am writing this letter to tell you about the latest news at my home. You'll never believe this, but my dad got a PROMOTION! He is now the assistant manager of a very big company. The next news is that i just became a brother, because my mother gave birth to a baby.
( CONCLUDING PARAGRAPH)