More info has come out from the Japanese government about this project, the new tower by Mori Trust on the former Akasaka Twin Towers site.
The tower will be 210m tall, construction will start in 2019, it will be completed 5 years later.
http://www.kantei.go.jp/jp/singi/tiiki/kokusentoc/tokyoken/tokyotoshisaisei/dai13/shiryou.html
http://www.kantei.go.jp/jp/singi/tiiki/kokusentoc/tokyoken/tokyotoshisaisei/dai13/shiryou1.pdf
Google Earth with the old buildings being demolished
June 2017

IMG_2623 by Momo1435, on Flickr
The tower will be 210m tall, construction will start in 2019, it will be completed 5 years later.
http://www.kantei.go.jp/jp/singi/tiiki/kokusentoc/tokyoken/tokyotoshisaisei/dai13/shiryou.html
http://www.kantei.go.jp/jp/singi/tiiki/kokusentoc/tokyoken/tokyotoshisaisei/dai13/shiryou1.pdf

Google Earth with the old buildings being demolished
June 2017

IMG_2623 by Momo1435, on Flickr