Japan's National Stadium was officially completed Saturday, when the centerpiece of next summer's Tokyo Olympics and Paralympics was handed over to its owner and operator, Japan Sport Council.A creation of Japanese architect Kengo Kuma's office, construction giant Taisei Corp. and design firm Azusa Sekkei Co., the stadium was completed in 36 months for 157 billion yen ($1.4 billion).The stadium with five stories above ground level and two floors below, is the latest incarnation of Japanese sports' spiritual home to be built in the neighborhood. It replaces the previous National Stadium used…READ FULL ARTICLE