Bank

The Bank is an auxiliary building for Power Sales. It does not sell anything on its own, but improves the sales in adjacent tiles. It increases only the sale capacity of office and does not multiply sale amount so never think your production will multiply.

The description in-game says that Bank improves sales by 2.5 times, but this is a misleading statement. What bank really does is add 1.5 times sale power of a building to it, flatly. So an office that has one bank next to it will sell 2.5 times the power. An office with two banks, however, will sell even 4 times, not 6.25 as one might expect.

To sum it up...

However, the flat nature of bank`s boost does not change the most lucrative strategy with the bank - each office should have as many banks surrounding it as possible. As shown on example below, a checkerboard pattern gives the most potent selling power improvement.