I watched Chris's video on the W-4 and he states that the packet should go to 1111 Const. Ave....that is the IRS address...not the Treasury so I am confused.  Does anyone have clarity on the proper address?  The US Treasury address is 1500 Penn Ave. NW.   Why is Chris saying to send w-4 to the treasury at 1111 Const. Ave?   

Hope someone can clarify this.  thanks!