Please- Help urgent- I3 lease in texas 2018

I am in dallas texas. Currently negotiating a 2018 bmw i3 lease deal. I am trading in an Audi A3 2017 which seems to have a negative equity of 3k. I owe 23k on this car.

Here is what I am being said : with 0.00152 mf and with 63% residual value, with msrp 50495 and selling price of 45 k my payment will be 299$ with 1500$ down.( remember when I trade in a car there is a tax credit.)

If not he says the one pay lease for 24 months is 6000$ and 36 months is 7500$.

Is the one pay a good deal?