Yes, but depending on how many buildings you already have, the price of new ones and tax will increase. Current tarification is in the table below.
# of bldg | Price of construciton | Tax |
1 | 20 000 | 0% |
2 | 40 000 | 5% |
3 | 60 000 | 10% |
4 | 80 000 | 15% |
5 | 100 000 | 20% |
6 | 120 000 | 25% |
7 | 140 000 | 30% |
8 | 160 000 | 35% |
9 | 180 000 | 40% |
10 | 200 000 | 45% |
11th and following buildings will cost you 220 000 gems each.
The tax is taken from combined gem income from all your buildings.