What is the significance of 99 years as a lease term for military bases?

I too, in all my years of studying in the field of World War II, have many times contemplated this deep and significant question. Finally after many years, I have come to the distinguished conclusion that 98 years is far too small a number, as it would not properly represent the dominion and power of the United States, and 100 years is too large, for it would make the United States seem a greedy nation.