Just playing around with shapes again. This time I'm using a smaller octagonal shape conjoined with a larger space of the same shape. The smaller octagon is basically a glorified 'stairwell' by which people get from one floor to another.
The floors are chopped up into perimeter rooms each one connected to a larger, central room.

Click image for larger version. 

Name:	double-octo-keep-levels.jpg 
Views:	49 
Size:	179.0 KB 
ID:	84129
Click image for larger version. 

Name:	double-octo-keep-levels-second-floor.jpg 
Views:	52 
Size:	700.4 KB 
ID:	84130
Click image for larger version. 

Name:	double-octo-keep-levels-third-floor.jpg 
Views:	44 
Size:	815.4 KB 
ID:	84131
Click image for larger version. 

Name:	double-octo-keep-levels-top-loor.jpg 
Views:	45 
Size:	193.0 KB 
ID:	84132