Interest on borrowings (however represented), bond discounts, costs of financing and refinancing capital (net worth plus long-term liabilities), legal and professional fees paid in connection with preparing prospectuses, costs of preparing and issuing stock rights, and directly associated costs shall not be allowable, except for interest assessed by state or local taxing authorities in accordance with § 3335.
D.C. Mun. Regs. tit. 27, r. 27-3333