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Unfortunately you are not right. Because it started on my second account at the same time as my main account while I definetely did not build any level 3 building or completed a side quest at all. Therefore I couldn't make it on time to get enough coins. I only gathered 250k because I just spend a lot on Duke and some other things... 1 week more time and I could have made it easily.

 

Next to that level 3 buildings need 6 days to complete so you could only made it if you already had enough money or you speeded up a bit to start a launch.

 

When the Training Center came, after a while you got another change to earn the building, hopefully we get same change to get Planetarium.