Reviewing the issue

After much discussion and clearing of doubts with the lecturers, my group realized that we should focus solely on the possible usage of the extra spaces below the newer HDB flats instead of the old ones.

Of all the newer HDB designs that I have researched on, I would like to point out The Pinnacle@Duxton.

The Pinnacle@Duxton is the world's tallest public housing. Created for the first international design competition for public housing, it has two sky-bridges connecting seven blocks at the 26th and 50th storey. Standing at the sky-bridge, one can have a breathtaking panoramic view of the city skyline.

Zooming in on the spaces within the building, not only is the Pinnacle@Duxton fully equipped with basic facilities such as tables, chairs, gardens and playgrounds, it also offers basketball courts and open dining areas for the residents.
In the case of the Pinnacle@Duxton, I personally feel that the usage of space is extremely well-thought out and there is more than sufficient communal bonding areas.

Credits:
http://vincenttraveljournal.blogspot.sg/2010/01/pinnacle-duxton-0901.html,  http://www.pinnacleduxton.com.sg/about.php