Leasing a garage to someone who doesn’t live in the block

I have an investment property which I rent out to a friend of mine who is in her 70’s.  Because she doesn’t drive I rented out only the apartment to her and leased the garage separately.  I was fortunate in the first 17 mths to have someone in the block leasing the garage.  Now it is vacant and has been for the last 3 months.  I have approached the body corporate asking them if I could rent it to someone outside the block. They will not allow it as they are concerned the person who leases the garage will have the security key to the garages and the internal block. As the unit is near the ocean, I am certain finding someone would be not too difficult.  I have noticed that the tenants use the visitors’ spots for their cars and I am trying to address this issue with the body corporate.  Whether that fixes my problem is another matter.  Can the body corporate prevent me from leasing the garage to someone who doesn’t live in the block? It is not a by-law under their Strata Rules.