2. Are there standard representations and warranties included inall commercial contracts?

No, Representations and warranties are always a matter for negotiation.
There are many commercial real estate contracts that say, in effect: "The property is being sold ‘as is.’ Seller makes no representations or warranties."
When a seller is making representations and warranties, the seller’s lawyer may insist on adding the cautionary words, " . . . to the best of seller’s knowledge."
That way, the seller is not guaranteeing unknown facts or conditions.
If you are buying income-producing property, your lawyer may want the seller to guarantee the accuracy of the rental income figures as well as the expenses the seller has represented to you.
You may also want the sales contract to include a statement that the seller is aware of no hidden defects in the building – that is, defects that your inspector is unlikely to discover.