I agree yellowchicks. Just add some 2x4s for support and plywood as walls. I would leave one side open (with hardware cloth) for ventilation. Also use hardware cloth to cover the entire floor to protect the chickens from predators.Since you live in a warmer climate, I would try to convert this entire coop/run structure into one larger coop, then build a new run.
The coop is at least covered by hardware cloth not chicken wire, so it shouldn't be too bad and can be converted to a bigger one easily.
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