plans-to-flank-Calgary-Tower-with-a-pair-of-33-storey-office-blocks-will-forever-alter-the-citys-landscape

http://www.calgarysun.com/2015/01/11/plans-to-flank-calgary-tower-with-a-pair-of-33-storey-office-blocks-will-forever-alter-the-citys-landscape

https://en.wikipedia.org/wiki/Calgary_Tower

https://www.google.ca/search?q=calgary+tower&safe=off&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjX_dWvrbvLAhVXzmMKHbOiDRYQsAQIOg&biw=1280&bih=699

http://news.buzzbuzzhome.com/2015/06/retro-photos-calgary.html