Paul,

I did find the floor tile file online where you can download for you building your floor plans. The Visio Cafe link that I provided earlier has it but, you have to look deep for it. Click on this link http://www.visiocafe.com/hp.htm and look for the "HP-Common" file. Download that file (it is a zipped file) and extract the stencils. The stencil "Floor-Layout" contains the floor tiles in different sizes (but, of course, you can edit them to fit your scale).

Hope this helps.