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Retaining Wall for landscape and parking (photos and plans attached)

Retaining wall required on the front of my section to then be landscaped and used for additional parking. I'm conscious of the cost of building a retaining wall for parking so I have four options unless you can suggest otherwise. 1) 1.8M retaining wall for parking + landscaping 2) 1.5M retaining for parking + landscaping 3) 1.8m for landscaping 4) 1.5m for landscaping