Attached Link: http://freebackend.daz3d.com/free_weekly/archive_list.php

There are literally hundreds of free stuff to look through here, some of them are Architecture, with floors.  Sometimes, you may not see the floor, due to it sitting, just a hair below 0 on the Y axis, but you can select the floor, and move it up to 0 or 1 or 0.5.  Also, setting up your lights so you can see the floor (usually by rotating the light source on the x axis) helps immensely.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.