 There are a number of reasons why perdurantists typically adopt universalism  First, the claim that there is a large number of nested four-dimensional objects is central to the most common perdurantist account of vagueness in persistence (see  section 5).  The building doesn’t seem to have a clear last moment of existence because there are very many coinciding building-shaped four-dimensional objects, each of which ends at a slightly different moment, and it is vague which of these is ‘the building’. Whether its role in this story is a reason to accept universalism depends upon the strength or weakness of alternative accounts of vagueness in persistence.