May be difficulties in doing the ground floor
eg
http://www.realestate.com.au/cgi-bin/rsearch?a=o&id=106008697&f=20&p=10&t=res&ty=&fmt=&header=&cc=&c=94077883&s=vic&snf=ras-mel&tm=1253579377
Upper floors have security entry, but not the ground floor due to layout.
Cheers,
The Y-man