9. Limitations on corporate business activity.
No professional corporation shall engage in any business other than the rendering of the professional services for which it was specifically incorporated; and no foreign professional legal corporation shall engage in any business in this State other than the rendering of legal services of the type provided by attorneys-at-law; provided, that nothing in this act or in any other provisions of existing law applicable to corporations shall be interpreted to prohibit such corporation from investing its funds in real estate, mortgages, stocks, bonds or any other type of investments, or from owning real or personal property necessary for, or appropriate or desirable in, the fulfillment or rendering of its professional services.