How Do I Get to the Muang Thon Tani Temporary Immigration Outpost for My 90 Day Report?

I visited the Muang Thon Tani temporary outpost of Division 1 Immigration today for 90 day report and experienced a guided tour of the area looking for the '6 floor building' mentioned on the .Gov website. For those like me who need a few more detailed directions, here goes. From Immigration on Changwattana Road, travel West towards Pak Kret and U-turn after the Sirat expressway. After passing under the expressway again, turn left at the first major exit (leading to Impact). Continue north past 2 roundabouts. After the second roundabout take the first right road and drive forward under the expressway bridge and you will be in the car park area with the 6 storey building in front of you.