Konami building on fire?

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 An image posted on twitter yesterday showed what looked the smoke coming from the Konami building in the Roppongi district.

So was the building on fire? Gaming site Kotaku.com.au requested comment from Konami and according to them the gaming company has confirmed that the building was not on fire and all is ok. So what was that emanating from the three quarters of the way up the high-rise?