Had buffet dinner at ตึกใบหยก, [tallest buiding in Thailand !] when I was in Bangkok -Tue 29th Sept i think Forgot to take pic of food though... too hungry that time
700 baht for lots and lots of food.
I heard if you wanna go up for the scenery only, it's 200 baht.
We got that one for half price because it was at night. haha. 20 Baht only