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.
12 C.F.R. §250.200
12 U.S.C. 221a , 371d