On realestate.com.au, you can search not only for properties to buy and rent, but also see what properties have recently sold. In the suburb where my church is situated, 14 properties have sold in the last 6 weeks. This presents a great outreach opportunity that churches are making the most of (thanks for reminding me about this Gerard!).
There's lots of ways to go about this, but here's one simple suggestion:
Very few people object to being welcomed and given a gift. Many people are actually quite stoked to be the recipient of kindness and generosity. Not only is this an act of neighbourly kindness, it's also an opportunity for meeting people and sharing lives and the gospel.