Originally Posted by Torrilin

I'd just store it in the basement. Most of the time, you're not allowed to alter the property if you rent, or the alterations automatically become the landlord's property. And a bike locker that's solid enough to keep your bike safe certainly counts as "alteration"... and it won't be cheap either.

(law varies from state to state, and sometimes even by city... check your lease and check what your local law is before making a decision.)