2,500,000 to build, pays out every 4 hours.
10x10 footprint
Aprrox. unmodded upgrade cost by level
1- 2,500,000
2- 4,175,000
3- 6,972,250
4- 11,643,658
5- 19,444,909
6- 32,472,998
7- 54,229,907
8- 90,563,945
9- 151,241,788
10- 252,573,785
Unmodified building payout by level
1- 6,200
2- 12,400
3- 21,700
4- 34,100
5- 49,600
6- 68,200
7- 89,900
8- 114,700
9- 142,600
10- 186,000
Times