If your purchased a home that was already foreclosed upon and there was no special assessment of record as to the home when purchased and not shown in your presumed preliminary title report, you would be responsible for the special assessment.If the special assessment was of record (meaning recorded) at the time you purchased the home, but did not show up in your preliminary report or your presumed title report, the title company should be responsible for this assessment.If the seller knew about the special assessment before close and did not advise you of it, then the seller could very well be on the hook for it. I suggest that you consult with a real estate attorney further regarding your situation.