Tearing down the old was probably the hardest part of this entire job. For the record, outside some help on the foundation work, I did this entire project by myself, with the exception of a few sheets of siding and a couple runs of metal on the roof.
Tool of choice for tearing down a building that is full of stacked lumber? Milwaukee Sawzall! The entire building was torn apart piece by piece with that one power tool and assistance with a prybar and hammer.
Had to remove the entire old north wall to get the foundation work done last year. The old footings were cracked and leaning out from water leaking in and freezing and pushing it out. Parts of that old foundation that we cut out were leaning about 30 degrees. Did all this work in two days.
I propped up the old roof with posts and basically cut out the walls from under it so we could do the foundation work on the rest of the north side.