To answer your question, it looks like the home WAS privately owned until it went to Sheriff Sale in July of 2012. The previous owner had a 6 month redemption period that has since ended.
The home currently has the Bank Of America listed as the owner. It currently is NOT on the market. It should be coming to market very soon since the redemption period ended about 2 months ago.
Let me know if you are interested in knowing when it comes to market and I can set you up on an automated search that will email you with daily updates that you can view for different properties in Pontiac.
My contact information is listed below, feel free to email me.