[LEAKYSEALS951]

After a beer or two, I latched on to the "one 120 sq ft 15 ft high structure."

I don't know if that would be enough room or not, however, I am assuming cali has no snow load, so you could effectively build a flat (or almost flat) roof with a 7 foot high first floor and a 6-7 foot high second floor with an exterior door to the second floor. A friend of mine did this in a shed and made an exterior door to the second floor with an I beam and electric winch to haul stuff up the the second floor.

On second thought, perhaps you should research the property tax/ inspection hits needed to make a real structure and then see if a solution presents itself.

This all depends on your needs. I have a similar sized shed out back. I could take pictures of the shi#$ I store in it to give an idea tomorrow if you are interested. On later thought, I think you might find the 120 (240) small in retrospect.

It all depends.....

edit 2- worst case scenario- build the 120 freebie, and if it isn't enough, add a real structure and keep the 120 freebie.

another option.. build an almost flat roof structure 15 feet high. Build shelves, then make a rolling ladder, like in a library, to access the upper shelves.