Be aware that you are selling multiple things.

#1 Goodwill - The value of what you and your reputation have added to the practice then things like

• Equipment - make a full listing of printers, computers, paper clips, tables, .... and value them. Remaining depreciation is an offset
• Lease - possibly you have a remaining one OR The sale of your building
• Software - possibly you have already purchased next year's software, or things like my good buddy  Tax Tools.
• other parts of the practice that you can assign value to.