Government filing charges published in the USCIS fee schedule, project administration or subscription fees charged by the enterprise or regional center, and professional costs for source-of-funds preparation, which is usually the largest professional item.
The capital is not the whole cheque
Hypothetical example: a Grand Bay-Westfield owner budgets the investment amount and nothing else, then meets a series of separate charges. Government fees for the petitions and, later, for the removal of conditions are set out in the USCIS fee schedule and change from time to time, so read them when filing. Many projects also levy an administration or subscription fee on top of the capital, and that money is generally not part of the qualifying investment, which matters because paying it does not count toward the threshold.
Then there is professional work: assembling twenty years of corporate and tax records into a coherent source-of-funds narrative is the item that consumes the most time. Add currency conversion and transfer costs, and Canadian tax advice on disposing of the assets, which is a separate question with its own consequences.