the price serves as the opening bid in the following rounds of negotiations always increase by 1 € Club premises:
In the fan shop expansion levels offer exactly 90% of the required price as the opening bid (435450 €, 1588099 € and 3126279 €).
For other buildings, however, the price required by the contractor varies, so no exact value can be determined.
But here, too, about 90% of the required sum is considered the starting bid.
For buildings where the contractor's demand fluctuates, start the negotiation several times and wait for a low opening request from the contractor.