To add another data point, I ended up going for a different c43:
2019 C43 Sedan
MSRP: $64,385
Sale Price: $49,936
Discount: 22.5%
12k miles
48 months
Monthly: $517
MF: 0.00139
Tax: 7.75%
Warranty started on the day I leased so it will cover the 4 years/ 48k miles.
Thanks for the help @Calvin.MB, I wish you had a 2019 MY in your inventory!