The property owner's name will appear on outgoing mail and emails.
You may want to update the owner's name formatting or change it all together.
Just open a deal and click the "Options" button within the Owner Information section. Edit the name and click save.
You can also update the owner's address. Mail will be sent to this address. Simply scroll down to the "Mailing Addresses" section and click the first address. Then you can edit it, like this: