Government filing fees at the amounts in the USCIS fee schedule, Form G-1055; the project's administrative or subscription fees; legal fees for the petition and for the source-of-funds package; and the cost of obtaining estate and historical records.
Separate the capital from every charge that is not capital
Only the qualifying investment counts toward the statutory amount, so the other lines must be budgeted on top rather than carved out of it. Government charges come from Form G-1055 and change periodically. Regional center projects typically levy an administrative fee that is not part of the invested capital, and its treatment should be confirmed in writing.
Legal work divides in two: the petition itself, and the source-of-funds reconstruction, which in an estate case is the larger job because someone must assemble and explain a chain reaching back before the deceased's death. Add the cost of obtaining probate copies, land registry searches, certified translations and, where a business or property was involved, a valuation. Financial risk advice about the project is a separate engagement from the immigration assessment and should not be blended with it.