We used propane torches in the shipyard, had hoses running everywhere, mostly tangled up with welding leads. There weren't as many mishaps there as you might think. A manifold on the ground with a pipe going up the side of the building might be a feaseable solution, with connection points on each level. Just something to consider.
Those hoses were pretty rugged, and welding slag didn't bother them much, but you'll be mostly cutting I suppose. Even when we did have a burner blowing slag onto one of em, and it burned through and caught fire, the pressure is very low with propane, and didn't make a big fire, and was easily put out and patched. Most everybody there had the little crimping tools and could crimp the line and patch it. I'm not sure exactly what type of blowback valves they used, but must have been good ones. I suppose either way you'll want numerous fire extinguishers available on each level, but with those little cutting hose fires, just crimping the line would stop it burning, and it could be patched on the spot. You'll possibly even want a "fire man(/woman)" on the project during demolition, to try and keep you a step ahead of disasters in the making.
When Bethlehem Steel closed in Beaumont/Orange Texas, their pawn shops filled up with top notch cutting torches. If anything similar is going on anywhere now, you might get a pickup load of em for little of nothing. Might even find a bunch of chain come-alongs and the like that way
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