Need to write an attorney closing letter to clients? In this article, we will cover the importance of sending a closing letter, what your firm should include in each letter, and a written example for reference.Here's some sample language that can serve as a place to start should you ever need to write your own closing the practice letter. If you're not finding the forms you need, contact us at (801) 238-7990 or Click here to contact the web navigator. We will not be able to process incomplete forms. Step 1 Provide your Power of Attorney documentation. We wish to take this opportunity to thank you for allowing us to represent you. Helping People Through the Probate Process. By Mark J. Morrise, Attorney 405 S. Main St., Suite 800. While our work is complete, you still yet need to take care of the following.