Create a conceptual model for the following firm. A firm has a number of sales offices. Attributes include office number and location. Each sales office is assigned at least one employee; employee attributes include employee ID and name. An employee must be assigned to only one sales office.

For each sales office, there is always one employee assigned to manage the office. An employee may manage only the office to which he or she is assigned. The firm lists property for sale. Attributes of properties include property ID and location. Components of location include address, city, state, and zip code. Each unit of property must be listed with only one sales office. An office may have any number of properties listed $($or none$).$

Each unit of property has one or more owner. Each owner owns some percentage of the property $($up to $100\%).$ Attributes for owners include name and ID$.$ A person can own more than one property.