This has been a landmark year for the world's skyscrapers. Despite the global financial crisis, 2012 saw the unveiling of Europe's new tallest building, the Shard in London - and by the end of the year, nearly three-quarters of the world's 100 tallest buildings will be located in Asia and the Middle East, a dramatic shift from west to east. With a growing number of people living and working in tall buildings, architects have become increasingly concerned with finding ways to introduce horizontal spaces - providing a place for residents to socialise, exercise and get some fresh air. Sharanjit Leyl visited The Pinnacle@Duxton building in Singapore, a public housing complex of seven buildings linked with 'sky bridges'.I've visited Pinnacle@Duxton. but have only seen Marina Bay Sands Casino from the ground. As Moshe Shafdan, the architect for the casino says in the interview, what they've done is "recreating the ground plane at many levels....extending the public realm upwards". But how to do that in a way that is cost effective. That is what I'm working on now!