Corporate Practice Series Portfolio No. 82-1, Third-Party Legal Opinions, discusses legal opinions in letter form that are addressed to someone other than the lawyer's client. The receipt of such an opinion letter, in a previously agreed upon form, by a third party, is frequently a condition of closing a commercial transaction of a magnitude justifying the expense. The portfolio discusses the custom and practice for giving and receiving such opinions in negotiated commercial transactions. The purposes and typical structure of the opinion letter are explained, as are some of the standard paragraphs that appear in such opinion letters.