Bart Sullivan, a senior vice president at WSP Cantor Seinuk, a firm that handles engineering for buildings like One World Trade Center, says building a residential skyscraper is generally more challenging than building a tall office building, partly because residential buildings have fewer internal columns and other corestructural elements.
Embedding the structural support in the core made it possible to cantilever the roof and thus wrap a glass facade around the building, using vast expanses of insulated, triple-pane glass and mahogany mullions.
The core economies have deep structural problems and the world economy is in a state of disequilibrium, says Jan Dehn, an economist at Ashmore Group in the U.K. Ashmore has its hands in emerging market debt.