Leasing to own is generally a bad idea and you will pay more for the car long term than if you just bought it. Using some rough numbers, this will cost you at least $4000 more than just financing.
60 month loan total before taxes assuming the same numbers (45000 after rebates) and 0.9%: $45600
27 month lease ($2000 DAS) plus 36 month loan (2.99%) for residual value before taxes: $49600
I was going based off of the previous poster for the percentage. With a total of $8000 in discount and 0% APR for 60 months, it is $49750. So not that much different than a lease in this situation, but I would advise caution moving forward.
If you are planning on doing another lease to own, look at both scenarios in their entirety. If the money factor is higher or the discount lower, it could cost significantly more to lease and finance than just finance.
I recently negotiated a 2020 RX350 F Sport because the wife wanted Apple Car Play. $58XXX MSRP, 13% off, $400 down, $490 a month with tax from Keyes Van Nuys. I miss the Parking Assist I had on my 2017 fully loaded RX F Sport. Apple Car play is a nice feature, screen is nicer and up front. Enjoy your new RX!