Tax returns are only relevant in terms of federal taxes. You can look up how much land tax he pays for each property in city land records. For example, if Trump Tower is assessed to be worth $1B he would be paying $7.2M in tax (NYC land taxes are 0.72%).
No one in the US must be paying their "fair share".Ok, well who cares? The reality is Trump, along with many other wealthy Americans, is not paying his fair share of overall taxes and its the plain truth for anyone who wants to see it.
Want to know the truth about the American economy read Robert Reich http://robertreich.org/post/5993482080. He says better than I can.