rent out detached garage with separate lease.

[Bob T.]

I have a house with 3 car garage (1 attached, 2 detached).   As we know housing doesn't paid for more garage space, with the proposed cut around $9.5 billion in 2018, my rent is not getting SAFMR (small area fare market rent) if I include 3 car garage.    so I wonder if anyone  separate lease for the detached garage?  can it be done without housing calling fault?    Of course I could just keep the detached for my own use but if I can get extra rent why not!   

basically if tenants want extra storage, I can charge $x that is separate from housing voucher.  is there any thing different I need to watchout for?

thank you!

-b