Here are the key Odoo modules to consider:

1. Sales

• CRM (Customer Relationship Management): To manage leads, opportunities, and customer interactions.
• Sales: For creating and managing quotations, sales orders, and invoicing.

2. Property Management

• Property Management Module: Custom or third-party modules specifically designed for managing properties, leases, tenants, and maintenance.

3. Accounting and Finance

• Accounting: To manage financial transactions, invoicing, vendor bills, and payments.
• Expenses: To track and manage company expenses.

4. Website and E-commerce

• Website Builder: To create and manage the company's website.
• E-commerce: If the company plans to offer online booking or purchasing options for properties.

5. Project Management

• Project: To manage property development projects, tasks, and milestones.
• Timesheet: For tracking time spent on various projects.

6. Inventory Management

• Inventory: To manage stock levels, property furnishings, and other assets.

7. Human Resources

• HR: To manage employee records, recruitment, and contracts.
• Payroll: For handling employee salaries and payroll processes.

8. Marketing

• Email Marketing: For managing email campaigns and communications with clients and prospects.
• Social Marketing: To manage social media campaigns and track their effectiveness.

9. Maintenance

• Maintenance: To manage and track property maintenance requests and activities.

10. Rental Management

• Rental: For managing property rentals, including contracts, renewals, and payments.

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Custom Development

• Custom Modules: Develop custom modules to cater to specific needs such as advanced reporting, analytics, or unique business processes.

Integration with Other Services

• Document Management: To manage and store important documents related to properties, contracts, and legal paperwork.
• Survey: To gather feedback from clients and tenants.
• Helpdesk: To provide customer support and manage service tickets.

Workflow and Automation

• Studio: To customize and extend Odoo applications without coding.
• Automation: To create automated workflows for routine tasks.

Additional Considerations

• Mobile App: To enable field agents to access information and manage tasks on the go.

Geo-localization: For mapping and location-based services for properties.