| Portfolio | A set of properties that the system believes are owned by a single landlord |
| Rental License | Some cities ask or require that landlords obtain rental licenses. |
| Property ID (PID) | The ID the uniquely identified a property. There are some variants on this because several condominiums may be situated on a single parcel of land. |
| Tier | Some cities designate use a tiered system to indicated the extent to which a landlord has been compliant with city ordinances |