"lease"

for the purposes of section 17(1) means a lease which—

(a)        was entered into for a period of not less than ten years;

(b)        was entered into for the natural life of the lessee or of any other person mentioned in the lease; or

(c)        is renewable from time to time at the will of the lessee indefinitely or for periods which, together with the first period, amount in all to not less than 10 years;

[Definition inserted by section 1(d) of Act 44 of 1997]