Final answer:
Victor Laskowski holds a fee simple determinable, which is a type of defeasible estate in property law that lasts as long as a certain condition is met—in this case, that the building on the property is not demolished.
Step-by-step explanation:
The case described in the question involves a certain type of property interest known as a defeasible estate, specifically a fee simple determinable. Victor Laskowski's possession is contingent upon a specific condition: that the current building on the property is not demolished. If this condition is violated, the property automatically reverts to the original owner or their heirs.
This is because a fee simple determinable comes with a possibility of reverter, which does not require any action to be taken by the original grantor to reclaim the property; the estate ends automatically when the specified event occurs. Due to the conditional nature of his interest, Victor Laskowski holds the property for as long as the condition is satisfied.