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Any of the stuff in the act applies regardless of it's a corporation or just someone who just rents their basement; it covers all residential landlord/tenant relationships.

So in that case when you find a buyer, the buyer would ask you in writing to give notice to the tenant and then you'd give the 3 month notice to the tenant. This would all take place after a deal was agreed upon I assume.

To get them out to do some work on the place before putting it on the market, there's not much you can do actually. Possibly try and negotiate with them, give them some sort of incentive. Offer to pay their first month's rent in their new place or something, the cost of that will be very small compared to the amount of money in the entire real estate transaction.