We've met this problem by factoring in something we cal 111 Compliance. 111 means November 1st, and what we can do with a prop on that day. We have to take 111 Compliance into every design we come up with, and includes how a prop can be disassembled and stored, what the effects of long-term storage will be, do they need to be stored in a climate-controlled space or not, etc. This enables us to always make props that can be broken down and stored instead of ones that eat up a lot of space.
If we can't make a prop 111 compliant, it doesn't get made. For example, I've been wanting a Headless Horseman for years, but to me a horseman with no horse just doesn't work, and I've yet to come up with a plan to make a 111-compliant horse that looks real. Someday I will.