Government charges for the application, at the amounts published in the applicable official fee schedules, plus business and immigration legal fees, a valuation, accounting work to document the source of funds, and working capital for the operation Jonas will run.
Restructuring the deal is usually the biggest line after the price
The investment itself dominates, since it must be substantial in proportion to the cost of acquiring the enterprise and genuinely at risk. Around it, the largest professional cost in a case shaped like this one is renegotiation. A business lawyer must redraft the purchase and shareholder agreements with the ownership and control requirements in view, and the seller's lawyer will bill his own side, which sometimes shows up in the price.
An accountant prepares the valuation and traces Jonas's funds from their origin. A U.S. immigration attorney reviews the structure before signature rather than after.
Government amounts should be taken from the current official fee schedules, including USCIS Form G-1055 where a filing is made with USCIS. Finally, budget working capital for the hires the staffing plan promises, because a plan without money behind it undermines the marginality answer.