How to fix foundation on corner of house

The house is over 115 yrs old and is a family home that my son now owns. He isn't the handiest DIYer and I noticed this when we visited I was parked near this corner of house. This is where the old workshop my grand father had and they made it into a computer room. What is needed to repair this? Is it going to take a professional before it eventually collapses and takes the wall with it?
q how to fix foundation on corner of house, concrete masonry, home maintenance repairs, how to
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