You would be surprised what people are regularly paying for a car. 850 is probably on par with what the parking/storage costs alone are. Those are almost certainly "priced in" to most houses, but there is no reason you couldn't work to reclaim a lot of that space.
More, I don't know enough about ZIPCAR to know how they price in the costs to refill the vehicle between drivers, but depending on how the fuel was managed, that is a 20% chunk of that, easy.
Concretely, googling "average monthly car payment", shows that "The average car payment for a new vehicle is $725 monthly, according to first-quarter 2023 data from Experian." So, not as incomparable as I could hope it is.