And from Googly 3D picture looks to been taken from the Winsland House upper floors.
https://www.google.com/maps/place/Marina+Bay+Sands/@1.3020722,103.8372936,154a,35y,125.38h,79.09t/data=!3m1!1e3!4m7!3m6!1s0x31da19042950679d:0x7e9eb96cc0e8d6f2!5m1!1s2018-05-30!8m2!3d1.2833754!4d103.8607264?hl=en