Old homes were sometimes built into hills like the home and garage on this property.
Rainwater runoff causes erosion, but lack of proper drainage can contribute to significant damage where concrete block is affected (see picture). Hydro-static pressure (pressure due to large amounts of water in soil) is what causes this damage. Repairs/replacement is needed.
Repairs by licensed professionals is always recommended for such involved projects.
Ray Wilson is a Home Inspector, covering all of Long Island (Nassau and Suffolk), the 5 boroughs of NYC and now upstate NY. For any home inspection related questions he can be reached at Meticulous Home Inspection Corporation. He can be reached at 631-902-6761.