The regional center's administrative fee, USCIS filing fees under Form G-1055 for Forms I-526E and later I-829, consular or adjustment costs for each family member, and professional fees. Capital-gains tax on the lot sales reduces the money available before any of that.
Budget from net proceeds, not the asking price of the lots
Hypothetical example: a Frontenac Islands landowner adds up the three lot prices and concludes he can fund the targeted-employment-area amount with room to spare. After capital-gains tax, a real-estate commission and legal fees on each sale, the net may be considerably lower. Against that net he must budget the investment itself, the regional center's administrative fee, which is charged on top of the capital and is not part of the at-risk investment, the USCIS fee for Form I-526E and the separate fees for conditional residence and later Form I-829, all set by the fee schedule, plus consular fees or adjustment costs for his spouse and any eligible child, medical examinations and translations.
Professional fees for source-of-funds work on inherited land are usually higher than for a salaried applicant because the documents are older and scattered. If the net falls short, the options are to sell a fourth lot, to add documented savings or to defer. Hypothetical example: A Frontenac Islands independent hardware-store owner receives an EB-5 project summary showing the qualifying investment but no estimate of supporting charges.
The first review should request a written schedule for the administrative fee, petition preparation, conditional-residence processing, and condition-removal stage. The offering documents settle the project fee; government schedules settle filing charges. Comparing net sale proceeds against every category before wiring reduces the risk that the required capital is consumed by costs that do not count as investment.