Apartment Renovation: Adding Room & Storage

I'm looking to modify my apartment by adding a new room, a bathroom, and a storage space on the rooftop, while keeping a portion of the rooftop intact.

Key Requirements:
- Identify the most suitable solutions for accessing the rooftop, the new room, the bathroom, and the storage area.
- The new additions should have a combination of connected and separate entrances.
- The living room needs direct access to the rooftop extensions.

Ideal Skills:
- Architectural Design
- Structural Engineering
- Interior Design
- Space Planning