The last one burned down in a terrible inferno. Local authorities concluded that the fires were traced to a meth lab explosion found in one of the tenants rooms.
The tenants, having moved on from that dark period in their lives of living in an apartment, have all coincidentally found themselves once again on hard times, forcing them to downsize their expenses and moving back to apartment life. Of course they all have standards, so they each all coincidentally found themselves in the same beautiful looking apartment complex. Somehow.
Just as coincidentally that Zai also is a janitor for this new place too. He's being paid a whole dollar over minimum wage this time.