Here is a quick summary which apartments are in the same building:

Building #1 close to Vienna main station:

• Penthouse Apartment with terrace and city view
• XL Penthouse Apartment with terrace
• Penthouse Apartment with city view
• Penthouse Apartment with terrace
• Apartment with balcony

Building #2 close to Opera in City Center:

• One- Bedroom Apartment at Opera City Center
• Studio Apartment at Opera City Center

All other apartments are single units in different buildings.