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Basement wall foundation

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We are evaluating an existing basement garage structure with concrete decking built 11 years ago. The basement wall footing is 12" deep and 30" wide. The walls are 9'-4" high 12" thick masonry block walls. All the perimeter walls are also served as retaining walls. The original structural details show only one continuous #5 rebar in the wall footings. Both the owner and us are not comfortable with it.
 
Can someone give us any retrofitting suggestion? It is a huge garage. The perimeter wall length is around 5000 feet.
 
Thanks in advance!
 
Julian Chu
Newport Beach, CA