12 C.F.R. § 250.200
(b) Section 24A provides, in part, as follows:
Hereafter * * * no State member bank, without the approval of the Board of Governors of the Federal Reserve System, shall (1) invest in bank premises, or in the stock, bonds, debentures, or other such obligations of any corporation holding the premises of such bank or (2) make loans to or upon the security of the stock of any such corporation, if the aggregate of all such investments and loans, together with the amount of any indebtedness incurred by any such corporation which is an affiliate of the bank, as defined in section 2 of the Banking Act of 1933, as amended [12 U.S.C. 221a], will exceed the amount of the capital stock of such banks.
(d) Accordingly the Board hereby grants general approval for any investment or loan (as described in section 24A) by any State member bank, the majority of the stock of which is owned by a registered bank holding company, if the proposed investment or loan will not cause either (1) all such investments and loans by the member bank (together with the indebtedness of any bank premises subsidiary thereof) to exceed 100 percent of the bank's capital stock, or (2) the aggregate of such investments and loans by all of the holding company's subsidiary banks (together with the indebtedness of any bank premises affiliates thereof) to exceed 100 percent of the aggregate capital stock of said banks.
(12 U.S.C. 221a, 371d)