I’d just say that once all offers have been received after the 48-hour period the buyer will consider them together and choose the property that suits him.
I believe that’s how sellers used to run it in the days of multiple offers. Not really a nice way to do business, but what goes around comes around…
Doubt the MLS forms handle this (as they do for multiple offers from buyers), but if it’s included in the offer terms in the first place, I’d say there’s not much the seller can do about it (other than decline the offer).
