The garage can be rented out to tenants *to park their car* or *store belongings* in the garage. It cannot be rented out to them to live there, since 1) it would be a multiple dwelling property; and 2) the garage would almost certainly not pass code for a certificate of occupancy, meaning there would be code  violations and an illegal rental, as well.(The garage could also be rented out to someone to use to practice music; to a business so long as that business could be run from that location given the zoning laws; etc. Just not for residence.)