I'm guessing this from the web site is not the answer you're looking for....
Quote:
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With the construction and good care, the tree can live at least 5 to 15 years. The costs of the build would be around € 50.000 and the care € 20.000 this year, and later on a yearly € 10.000.
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But it is all I could find from here, maybe Q or Blair can get better info from the city itself?