A clause within a lease denoting the fact that if or when the ground lease has expired, the building will be demolished per such clause. The lessor must notify the tenants within an established time of such condition.
your policy covers only the direct damage to your building therefore it is necessary to also cover the cost of removing the undamaged portion as well. You may have a concern with your local by-laws as well.
A provision that excludes liability for costs incurred in demolishing undamaged property, often necessitated by building ordinances requiring that structures must be demolished after a certain degree of damage has been sustained.