Based on the numbers you mentioned the Residual is 58% and the depreciation is about 44k. Also the total rent fee due to MF 0.00170 is 10.6k thus the total lease fee is 54.5k or ~1500 monthly payment (tax excluded and zero down).
Have no idea about sales tax in your state. In some states the tax is based of capital cost and in some states (like CA) is based on lease cost...You can also read this thread:
http://f80.bimmerpost.com/forums/sho....php?t=1084623