Dimensioning in assemblies

     Hello,

I built a plant model with seperate buildings and put them all into an assembely, now I need to dimension how far all the buildings and towers are from eachother. Is it possible to go to a top view and do a 2D type dimensioning? Or do I have to dimension from the base corners of each building? When I first tried dimensioning from the top view, it would try to dimension from the roofs of buildings sometimes and there would be a slant. (adding a larger distance between the buildings) Also, if I have to demension from the bases of the buildings, how do I dimension to the center of circular towers if they have a square base?

Thanks in advance if anyone can help.

SolidworksAssemblies