It's an emerging area of certification, this article discusses a bit about it for you but basically there are two main areas of halal property. The first being where and how it's built, this includes the obvious things like not being built on a cemetary etc, plus of course not being near a bottle shop or other haram business. The second area relates to how the building was funded, was it Sharia compliant, is it suitable halal for rental income? 
http://mforum.cari.com.my/forum.php?mod=viewthread&tid=867407

There was also a plan to build a halal estate in NSW a couple of years back which received outrage as it was considered divisive, so no doubt it's been put on hold until we're more accepting of that level of discrimination
http://www.dailytelegraph.com.au/plan-for-muslim-housing-enclave-in-sydney-suburbs/story-e6freuy9-12...