And deconstructing is different than building.
It's pretty dangerous. You're already dealing with a structure that is deteriorating. Every board you remove could cause collapse. You have look it over thoroughly and be aware of where it is weak and what is holding it up right. Knowing building construction is vital. Remove one wrong board or support at the wrong time and you could find yourself trapped or worse.
I have had building that the termites had ate the wall studs and braces and the only thing holding up the roof and supporting the building were the 1x boards on the sides. If I hadn't checked and started removing them first like I normally do it could have been bad.
It boils down to a little knowledge, a little science, intuition, and listening to the building as you take it down. Pay attention to gaps in joints. Are they growing? What happen when I did this? Situational awareness.
Most are pretty straight forward and I have steps I take in order as I take them down. Others will challenge you, like this general store. This was a very dangerous building for 2 reasons.
1. It was a balloon frame construction.
2. Termites had damaged a lot of key support areas.
This building WANTED to fall. I had to remove enough wood before hand so it all wasn't damaged. You work to a point to where you walk away and say enough, time to put it on the ground. Whatever gets damaged is just loss. Can't let greed overrule safety. Listen to your instincts. "Listen" to the building. I know that sounds crazy but it's true.
Edit - I would actually sit far an hour or two and study this building. What what weak, what I thought was holding it in place. I would remove something and go check other areas of the building and see if I had movement in the joints, or more lean. I would have points marked and checked for movement of vertical walls. And when by myself I don't have a spotter to watch for movement or shifts. When my gf is with me I use her for that a lot but now she is home with the baby so that's out. I have asked landowners to come and witness certain operations in case things go bad so I would have someone there that could call for help.
Made it back from Florida this evening so back at it in the morning.