Why is my file 183mb?

I have a file with a column flanked by a 50s screen on either side that I modeled. I have about 18 different variations of this model copied within the file. Even so, why is it so big at 183mb? I tried loading it as a block linked insert, but then it wouldnt show up in perspective mode and I had to explode it to view. Not sure what to do to bring this file down to a reasonable size? Anyone have a solution?

Can you send the file to tech support please?
http://www.rhino3d.com/upload

Here it is… over 150mb now

You have to use dropbox or something of that nature. The file is too large to be attached to your post.