The USCIS fee for the investor petition and later for Form I-829 as listed on Form G-1055, the regional center's administrative fee, immigrant-visa or adjustment fees, legal and translation costs, the appraisal, and the interest on the loan, which is a personal expense and not capital.
Only the investment is capital; everything else is cost
The threshold amount is the capital that must be placed at risk in the new commercial enterprise. Around it sit expenses that are real but do not count. The regional center charges an administrative fee that is typically paid at subscription; it is not invested in the project and is not part of the US$800,000.
USCIS charges a filing fee for the investor petition and, at the end of conditional residence, for Form I-829, at the amounts on the current fee schedule, which this site does not quote because it changes. The immigrant-visa application or adjustment of status carries its own government fees. The investor also pays for an appraisal of the farmland, certified translations of French deeds and loan documents, and professional preparation of the source-of-funds file.
Interest and principal on the bank loan are personal obligations that continue regardless of the project's performance, which is the true cost of borrowing to invest. Note the statutory adjustment of the threshold from January 1, 2027 when planning the loan amount.