456, X Street, Y Avenue,
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Jack Martinez,
As you enter into retirement it is time for us to profess our thanks for the years of leadership that you have given the company. We have never met anyone who has combined gifts of wisdom, fairness and control to such an extent and you have been the best manager this firm has ever known. You have helped everyone of us and you have touched all of us deeply. We cannot thank you enough for the hard work you have put in, and the guidance that you have provided. It is time for us to wish you all the best for your retirement years.