10 Property Management Mistakes You Never Want to Make 1. Not screening tenants. 2. Not maintaining your property. 3. Letting your tenants pay late. 4. Not having a lease in place. 5. Not collecting a deposit (or last month’s rent). 6. Not getting post-dated cheques. 7. Not having the utilities switched over. 8. Making friends with your tenants. 9. Allowing animals. 10. Being too nice.