i am for one single large building. over the years different stuff comes up, and i end up storing something large, or small multi stuff, but will not fit were i located all the other stuff that may go for it. it could be painting, wood working, metal, fixing up/building lawn chairs (wooden), to fixing tractors /cars, holding some stuff for a friend/family temporarily as they move, tossing up a deer, or other animal, to storing some extra lights, fixtures, misc part bins, etc... that eventually comes along from various projects (pack rat here).
a multi buildings just a big pain, more so when it comes to electrical, plumbing, heating, cooling, toilet, extra cloths (gloves, masks, glasses, helmets, etc...) more so when it comes to pulling stuff out to use it and then putting it away. a something there something over there. i do my best to keep things organized half way, but half the time i have a "junk table" that ends up getting a heap of crud on it, before i get around putting everything back to were it belongs.
i am in a firm believer various local stores have something with how they store stuff and put stuff up for sell. and try my best to kinda replicate same like doing in the building, some areas were i can stand lumber / pipe / fence posts / etc... up on end and have some stuff shooting out to keep it falling over, and not 40 pieces plus thick to get back to something different, but maybe a half dozen if that. (floor space), an isle per say were i keep corded power tools, an isle were i use screws / nails / wire hanger staples to hang all the various types of hand tools (screw drivers, hammers, paint brushes, zip ties, drill bits, sockets, etc...) a isle / side of a rack, for grease, fuel cans, various oils, and fluids for all the tractors / cars/ 2 cycle engines, etc...
some times i need a really large work area, so out goes the tractor, and some smaller stuff (engine lifts, chop saw, table saw, pull behind sprayer, wheel barrow, concrete mixer, and other like stuff) all get shoved up against a wall opening up a big area in middle so i can set out some stands, or do what ever i need to do, say glue and clamp a bunch of lumber together. brush on some paint or like.
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get over the "look" of something huge, bigger than house. it is the norm. at least in my opinion, and travels i have made, large buildings = functionality, and not spending 3 times longer walking ever were due to differing sheds / buildings.