Name this building in Singapore and can I visit the glass pyramid on top?

Singapore is packed with skyscrapers and iconic architecture so I guess this one just gets lost in the crowd since despite tons of Google and Wikipedia searches I can't identify it.
Its main feature of interest is a huge glass pyramid on top which looks to be quite a few stories high. At night the pyramid is lit and subtly changes colours.
I realize there are plenty of other buildings with aerial views of Singapore so I'm not looking for "Try the XYZ instead" answers. I want to know specifically the name of this particular pyramid-topped building and I want to know if it's possible to visit the pyramid part.
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2017 Twenty-five Year Award: Grand Louvre - Phase I
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Images: George Pak, Irina Iriser, Stacey Gabrielle Koenitz Rozells, Irina Iriser