Q. We have a townhouse with a garage below ground level. The building was new when we bought it 17 years ago. The driveway ramps down from the sidewalk to the garage door, and we have concrete retaining walls on both sides, about 7 or 8 inches thick. It’s about 6 feet tall at the bottom of the driveway. About two years ago, we noticed that the exterior retaining wall was leaning .

 Now, I’d say it’s leaning slightly more, about 2 inches at the top. Is this something to be concerned about? How do I figure out if I need a masonry company?