I'm renting out a garage space behind my duplex rental property in Chicago, and I want to be sure I'm approaching this correctly. 

Currently, the other space is occupied by a tenant and it is wrapped into the lease. 

This spot, however, will be rented by a nearby neighbor whose apartment doesn't include parking. 

I want to protect myself from any damages if they accidentally bump the garage door, or the other tenant's vehicle, but I also am not sure if it's accurate to use my regular tenant's lease, or if it's appropriate to ask for a security deposit.

The spot is going for $200, and with my leases I normally ask for a security deposit equal to 1 months rent.

I've heard of a storage space lease, but I don't want this to be used as storage as I cannot provide additional security beyond a door lock, working lights, and closed garage door that the tenants are responsible for closing. 

Thankful for advice.