Gap concering above has widened during the past 8 months. Home is approx 1200 sq ft. Concrete block construction, built in the early sixties. About eight years ago, home was gutted, new interior walls and new trusses and roof put on. Existing terrazo floor has crack down center. Eight months ago terrazo was clean crack, now seems to have tiny cracks spidering out from it. Have used level on floor and and floor is lower in center of house by 3 inches from edge of interior. Doors do not close properly. Also, large (six inch hole) in driveway (sloping drive) concrete. Seems to be collapsing. Help. Suggestions Please. Thanks.