How to convert garages into higher income spaces in residential zoning?

[Geneva Michaelcheck]

Hi BP, 

I'm in contract to buy my first 4-plex, which has 2 underused accessory buildings that I would like to turn into money makers. One is a row of 5 garages, the other is a row of 4 storage units. The property is in a residential zone, so I'm told I can't convert them into any commercial space such as artist studios, offices, etc. But I KNOW I could make more out of them if I could rent them as finished space, rather than as garage/storage. 

Any ideas on how I could creatively renovate and market these spaces for $$? 

Thanks! 

Geneva

Ideas I've considered: 

* Rent them as "hobby space" for artist studios, workshops, or man caves, clearly stating in the ads and lease that no commercial use is allowed. 

* Turn garages into a 1BR loft-style apartment. Leave storage units as-is.  

* Finish the spaces and attach them to the current apartments as bonus rooms and charge higher rent (once current tenants move out).