Prepare an E-R diagram for a real estate firm that lists property for sale. Identify all entities (supertype/subtype), attributes (optional/required), unique identifiers, relationships and relationships cardinality and optionality. Resolve any M-M relationship you find.

• The firm has several sales offices in several states. Each sales office has Office_Number and a Location.
• Employees are assigned to work in different sales offices. Each employee has an 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 that office. For each manager we record the start date of the management job.
• The firm lists properties for sale. Each property has an ID, description and Location.
• Each unit of property must be listed with one (and only one) of the sales offices. A sales office may have any number of properties listed.

Each unit of property has one or more owners. owners have ID and Name. An owner may own any number of properties. For each property we must record each owners percentage of the property

Note: do it on lucid chart the website