## Overseeing_Company

id | name | contact_info
--- | --- | ---
1 | Company A | +123456789
2 | Company B | +987654321

## Project_Milestone

id | milestone_description | start_date | end_date | development_project_id
--- | --- | --- | --- | ---
|  |  |  | (→ Development_Project.id)
1 | Foundation Completed | 2023-01-01 | 2023-01-10 | 1
2 | Framing Started | 2023-01-11 | 2023-01-20 | 1

## Development_Project

id | project_name | developer_id
--- | --- | ---
|  | (→ Overseeing_Company.id)
1 | High Rise Building | 1
2 | Residential Complex | 2