The Mayor has sole power to appoint "all * * * officers not elected by the people, except as otherwise provided by law" (NY City Charter § 6 [a]). The proposed Independent Police Investigation and Audit Board would not be a "purely investigative" body ( Matter of Henry v New York State Commn. of Investigation, 141 Misc 2d 849, 857-858, affd 143 AD2d 914) and its members would constitute officers, which in the analogous context of Civil Service Law § 75 requires only "that some sovereign power, whether great or small, be exercised in the position" ( Matter of Nolan v Tully, 52 AD2d 295, 298, lv denied 40 NY2d 803, appeal dismissed 40 NY2d 844). Since defendant Council would "limit or impair" protected powers of plaintiff Mayor ( Quigley v City of Oswego, 71 AD2d 795, lv denied 48 NY2d 607), the enactment "impinge[s]" upon a statutory executive function ( see, Matter of Sacco v Maruca, 175 AD2d 578, 579, lv denied 78 NY2d 862), and an executive power has been transferred within the meaning of Municipal Home Rule Law § 23 (2) (f). The IAS Court properly held that defendant cannot, by enactment, force plaintiff to share statutory power ( see, e.g., Matter of Heeran v Scully, 254 NY 344; Neils v City of Yonkers, 38 Misc 2d 691, 697). We decline to sever any portion of Local Law 13 inasmuch as we do not find that, "`if partial invalidity had been foreseen,'" defendant "`would have wished the [Local Law] to be enforced with the invalid part exscinded'" ( Association of Surrogates Supreme Ct. Reporters v State of New York, 79 NY2d 39, 47-48). Knowing the Mayor's objection to Local Law 13 because of its shared power of appointment, the Council nevertheless overrode his veto and adopted Local Law 13 without a severability clause. In such circumstances, it cannot be credibly argued that it would have wanted the invalid part excised.