The existing house had a lot of brick which the owners preferred to upgrade with stone.
The yellow areas are where area was added to the existing house. The garage entrance was oriented to face the street.
The owners wanted stone on the front facade, and stucco instead of the vertical board and batten siding.
The upper option shows consistency in materials in the old and new - stucco in the upper half of the whole house, and a stone skirt below tying the house together.
The lower option shows the entire front wall of the addition on the left clad in stone which helps balance the large expanse of garage doors on the right.