The closing statement from the property sale, bank records tracing the proceeds through every account, the franchise agreement and paid fee receipts, the lease and equipment invoices, plus any escrow agreement showing that funds will be released when the visa condition is met.
Show the money leaving, not just sitting
Proof of funds and proof of investment are different things, and both are needed. Proof of funds establishes lawful origin: the sale agreement for the rental property, the statement of adjustments, the mortgage payout, and tax filings covering the years the property was owned. Proof of investment establishes a real commitment to the enterprise: receipts for the franchise fee, the signed lease with rent paid, invoices and payments for equipment and build-out, bank statements for the business account, or a binding purchase agreement backed by visa-contingent escrow.
Every intermediate account matters, including any currency conversion. Where a sum remains in escrow, produce the escrow terms showing that release is conditioned on visa issuance and that the funds are not otherwise freely withdrawable.