Private doors and shared entrances need different plans
A key to your unit may also open a shared entrance, or those doors may use completely different systems. Before changing a lock, identify which door is involved and who is authorized to approve the work. That is especially useful when a house has a separate unit or a building has common access.
With rekeying, a compatible cylinder accepts a new key while its previous key stops working. The handle and other sound hardware can remain in place. If the lock is part of an existing master key system, the change needs to fit the agreed access plan rather than being treated as an isolated replacement.
Bring the owner or property manager into that discussion. A private unit key and a manager's authorized key may have different roles. We can discuss compatible master key arrangements when selected access groups are needed. Giving everyone the same key is a different choice with different consequences.
For the handover, identify each new key and check the openings it is meant to operate. Confirm which old-key access should be removed and which authorized access should remain. Keep keys for unrelated spaces separate so they do not get mistaken for part of the completed work.