Appraising 8-unit with half Airbnb units

[Stephen Lassiter]

I've been looking for small multifamily deals. I found an 8-unit where the seller is renting 4 units short-term on Airbnb. The regular long-term units are getting around $400/month while the seller claims the Airbnb units are bringing in $925/month. Using the income approach, do I really include the Airbnb income to value this property? Or would I just use long-term market rents for all units? Of course if I was the seller I'd want it to be valued using the Airbnb income. But from a buyer's perspective, I just want to value it as if all units were getting $400 because I really wasn't intending to operate an Airbnb. Is there a 'standard' when it comes to something like this? How would a building like this be appraised?