Dear Mr. Landsman:
I just wanted to take a moment to express our appreciation for your efforts in bringing this most troublesome case to a very successful conclusion. I also want to compliment you for the manner in which you kept me informed and the very cooperative attitude you displayed towards me at the time of our several conversations during the life of this file.
It certainly seems to me that the strategy you employed contributed significantly to the ultimate and very successful conclusion of a file that had tremendous potential.
Again, thank you most sincerely for your efforts and in keeping me closely advised as the case went forward.
Very truly yours,
[Name Omitted]
Assistant Vice President