Former President Donald J. Trump is facing an IRS inquiry over improper tax breaks claimed for his troubled Chicago tower, RadarOnline.com has learned. The 92-story skyscraper, the tallest among the GOP leader’s projects, was a financial failure due to cost overruns and poor timing during the Great Recession. The Internal Revenue Service (IRS) inquiry suggests that Trump could face a tax bill exceeding $100 million due to a yearslong audit battle over the “double dip” claims. Originally intended to be a profitable venture, the tower faced significant cost overruns and adverse market conditions…