Pyongyang has a rapidly evolving skyline, dominated by high-rise apartment buildings. A construction boom began with the Changjon Street Apartment Complex, which was completed in 2012. Construction of the complex began after late leader Kim Jong-il described Changjon Street as "pitiful". Other housing complexes are being upgraded as well, but most are still poorly insulated, and lacking elevators and central heating. An urban renewal program continued under Kim Jong-un's leadership, with the old apartments of the 1970s and '80s replaced by taller high rise buildings and leisure parks like the Kaesong Youth Park, as well as renovations of older buildings. In 2018, the city was described as unrecognizable compared to five years before.