Usually for the sponsor's costs of raising and managing the offering — legal work, economic reports, marketing and servicing. That fee is separate from your qualifying capital, and calling an account 'administrative' does not make a payment count as invested capital; the legal requirements and actual use of the funds decide that.
Budgeting the review you actually need
The qualifying investment is US$1,050,000, or US$800,000 where a targeted employment area or infrastructure project qualifies, with statutory adjustment beginning January 1, 2027. Around that sit fees no one can total in the abstract — filing, counsel, securities review, translation — though each professional can quote their own scope in writing. Do not assume a single payment date covers everything, and do not treat a refund clause as a substitute for diligence.
The immigrant investor petition fee and later the I-829 fee from the USCIS fee schedule, any regional center administrative fee, translations of the parents' records, and professional fees. Professional fees for assembling source-of-funds evidence are often the largest advisory item, and a file involving a long-held registered plan and an estate distribution is at the heavier end of that range.