Okla. Stat. tit. 18, § 18-806: Purpose of formation of professional entity

A professional entity may be formed for the purpose of rendering

one specific type of professional service or related professional

services and services ancillary thereto and shall not engage in any

business other than rendering the professional service or services

which it was organized to render and services ancillary thereto;

provided, however, that a professional entity may own real and

personal property necessary or appropriate for rendering the type of

professional services it was organized to render and may invest its

funds in real estate, mortgages, stocks, bonds and any other type of

investments.