75. Notwithstanding section 74, a plan may acquire and hold real estate in Canada, a lease of which is made to or guaranteed by:(a) the Government of Canada or of a province or an agent of the Crown or a municipal corporation; or
(b) a corporation or a cooperative agricultural association, the common or preferred shares of which could be, at the date of investment, authorized as investments by this Division; or
(c) a cooperative association or savings and credit union, the shares or preferred shares of which could be, at the date of investment, authorized as investments by this Division;
provided such lease produces a net revenue sufficient to yield a reasonable interest return on the amount invested and to repay at least 85% of such amount during a 30 year period, or during the period of the lease if the latter is shorter.