CMU Block Crawlspace Foundation - Openings?

No. You do not need a structural engineer for that small hole.

Narrative example:

There was a small (approximately)10" x 10" hole punched in to the block wall separating the units. I recommend asking the owner about it, having a foundation contractor assess it to determine its reason and make a proper cure for that reason e.g. air movement?, etc. or sealing it closed.

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