Build Buildings on Deep Water

[bbfreak]

I'm building buildings on top of water and it's all working out ok except the position of the building. When you are about to build it and you have the green square showing you where its going to go I think it's showing the green square on the land at the bottom of the water and not on top because the building gets place about half a square above where you think its going to go. Is there anyway to fix the location of the green square to above water location?