Building on a slope?

I’m wanting to build a big garage on my property with a solid concrete slab as the floor but the only spot I can put it is narrow and on a hill so half to garage would be sticking about 15-20ft off a ledge with a decently long and steep slope. What would be the best way to support the garage without being too... show more I’m wanting to build a big garage on my property with a solid concrete slab as the floor but the only spot I can put it is narrow and on a hill so half to garage would be sticking about 15-20ft off a ledge with a decently long and steep slope. What would be the best way to support the garage without being too expensive. I’ve thought of doing concrete pillar type of thing but I’m not sure how expensive that would be. I don’t wanna dig into the side of the mountain to make a flat area cause I’d have to worry about water flow and building a retaining wall. Any suggestions?
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