Learn how to create an accurate affidavit letter with our free printable templates. Customize and Download this "Third Party Affidavit Letter ".Learn how to craft an effective affidavit letter with our sample and essential components. The Assessor's Office maintains the official real property mailing address records for Clark County. The form can be filled out and submitted in PDF format. Visit a store or an organization that provides legal forms; or preferably consult your own personal attorney. Application Forms, Do I Need a Permit? Select Letterhead and Envelopes and complete your order. You will need the information below. Forms. Forms. Law Book Probate.