huh... why got so many answers...
I have an office at MND building.
Most direct way, via exit G. Turn left follow the pavement walk
till ah moy food centre. There's 3 elevators. Beside the elevators,
there's a stairs. Go up till level 3. You'll be on the "ground"
floor carpark right in front of Annex A.
Alternatively, via Exit A, turn right walk along the road. The
coffeeshop should be on your right. The 1st shop on your left is an
indonesia/thai restaurant. walk all the way, till the intersection
with the main road. (on your right is a red building, I mean really
totally red. Its the red dot musume). The building across the main
road is URA building. Cross the road, walk into URA, (and enjoy the
aircon) take the stairs up and youll be there.