Orchard Central is my favourite mall. 12 storeys high + another 2 level in the basements. 4 Super escalators (the longest serving 4 storeys straight), 12 glass elevators, maze of shops in there and many commissioned art pieces around the building. Looks best at night but i usually won't have time to capture the pic at night.
But this place is a ghost town due to its design, rumour has is that rental gone as low as S$5 per square foot and next door mall is fetching S$80-100 psf!