Gasoline and Lawn Equipment Storage?

Hello! At my company, we do our own lawn and yard maintenance so we're needing to store a few things like a lawn mower, weed whacker, rakes, and containers of gasoline for the lawn mower. Would these have to be stored off site or would there be an acceptable way to store these at our facility? Like in a locked area of our warehouse? Any advice is greatly appreciated! 

I would store them outside in the shed under lock and key--or the maintenance shop as long as that door is also kept locked

The key is to just ensure they cannot be accessed by random employees