30 x 40 x 10 build and cost

My 24x30x10 garage cost $37k in 2010-2011 when the previous owner built it. Has a thick slab of concrete for a lift, not sure how thick, no apron off the door. He did absolutely none of the work, it's not insulated, or wired besides three outlets. I wish he would have built a 30x40, the limit in my town.