It shall be lawful for licensees to complete listing or sales contracts or leases whose form has been prepared by legal counsel and such conduct shall not constitute the unauthorized practice of law. In completing a lease or a written offer to buy, sell, lease, rent, or exchange real property, a licensee shall include a description of the property involved, a method of payment, any special stipulations or addenda the offer requires, and, upon acceptance by the offeree, the date of such acceptance.