Consider a real$-$estate company, which manages rental properties. Each property has an address, several bedrooms, bathrooms, and car spaces. A rental property may have several rental agreements. A rental agreement details the weekly rent that is agreed upon with one or more tenants for a property for a given period. For each of these tenants, the details that need to be recorded include first name, last name, and date of birth. At any point in time, each staff member must be responsible for managing at least one property, where a property can be managed by multiple staff members and must be managed by at least one staff member at any point in time. Staff members also have a first name, last name, and date of birth. At any point in time a property is owned by one or more landlords. The ownership of each property may also change over time.

The E$-$R diagram shown below is one attempt at modelling this domain. Consider what errors you can identify in this model.