If the rest of the money is all dealer contribution, and you get to pay only $1000 down followed by $375 every month over 3 years, then it sounds like a very good deal. To be honest, I don't believe the two numbers. Are there hidden fees somewhere? Are you sure the $375 include your rent charge plus California sales tax?
Do the math, starting with the MSRP, minus some reasonable dealer discount, minus $7500 federal tax credit, plus CA sales tax, a few fees, minus a residual value slightly higher than 60% of the original capitalized cost after 3 years. Divide by 36.
I didn't have much negotiation margin for my 2015 BCED I custom ordered, MSRP 47k, less $2500 discount, less cap cost reduction, resulting in a net capitalized cost of 36k. The lease I got was MB's standard lease over 36 months - slightly over $500/month, including taxes and all fees - no hidden fees, still more attractive than paying a standard car loan over the same term with a downpayment equivalent to the lease residual value plus my $4000 lease downpayment.
In researching, I noticed folks across the US will get very different lease formulas. The advertized and extremely attractive lease from mbusa may not necessarily be available for all B Class models in the Bay Area, especially given the higher demand in the Bay Area and its expensive standard of living.
I believe for any 2014 B Class you will get a much "cheaper" lease than for the 2015 model.
