Unpaid property taxes

[Felicia Hamilton]

I was looking around at properties in an area that I'm highly interested in, and found one multifamily building that the owner has not paid the property taxes for 2018 (so 6 months past due).  The building is not listed for sale, but I'm wondering... is this indicative of a financial hardship?  Should I approach the owner with an offer to buy?  Is this in bad form???  Should I mind my own business on this... Lol... 

Anyone familiar with the rules of acquiring properties with delinquent property taxes?  I imagine, being 6 months late is not a reason to force a sale, but what is the time frame?