Not clear to me, is this a purchase or a leased space situation? Month to month lease
Additionally, what of value of yours besides the car is inside the space? Tools and parts
Are you likely to "harm" the space or others nearby in your use of this space, and need liability insurance for your protection? Being that the units are connected, something 'could' happen because of me (not intentionally of course). Also thinking in terms of damage from possible storms.
Not hearing enough yet any insurance beyond the car is financially prudent.