Answer: The mature size of 'Tiny Towers' projection is based upon the parentage of this plant (Cupressus sempervirens 'Glauca') and the expected rate of growth. Your growing conditions may vary and so might the mature size, but I think it's safe to say they will reach 30' in 15-20 years.
Monrovia does not have Tiny Tower plants larger than the 7-gallon size, but a landscape contractor may have some available. Try contacting a few landscape professionals in your local area. If they do not have the plants, they may know of a source.
Best wishes with your landscape!
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