I'm looking at a property right now that has a cinder block perimeter foundation with a brick paved floor inside (brick on sand). House is 20 yrs. old. No visible cracks in foundation or evidence of shifting. There are a few uneven bricks in floor, but those can be fixed easily by lifting up brick and filling in more sand. I do question the stability of the cinder block foundation. I have no experience with this type of building technique. Any advice?