An itemised allocation of the purchase price, every remaining condition to closing, the exact terms on which escrowed money is released, and a complete list of the assets and staff being transferred. Those four documents answer most of what an officer will ask about.
Four things to settle at the negotiating table
Buyers negotiate price and then discover that the immigration questions were decided by clauses nobody discussed. Raising them during the negotiation costs nothing; raising them afterwards means reopening a signed agreement. Ask first for the price to be allocated across land, buildings, equipment, livestock, inventory, goodwill and any residence, because that allocation is what separates business capital from personal assets.
Ask next for a plain list of conditions that remain outstanding, since a deal still subject to financing approval has not put anything irrevocably at stake. Ask third for the escrow instructions themselves rather than a summary, because the release trigger determines whether the money is at risk. Ask fourth for the employee list with roles, hours and wages, which is the fastest evidence on marginality.
Hypothetical example: a purchaser near Saint-Joachim-de-Shefford signs a friendly agreement with a single price and a clause letting either side walk away until the final instalment clears, and then has to renegotiate both points under time pressure. Sellers usually agree to all four when asked early, because none of them changes the price.