a. The owner of a multiple dwelling shall whitewash the walls enclosing all courts and shafts not made of light-colored brick or stone or shall paint such walls a light color, and shall maintain them in a clean condition.
b. As often as it deems necessary, the department may require the owner of a multiple dwelling:
(1) To rewhitewash or repaint the walls enclosing courts and shafts not made of a light-colored brick or stone; and
(2) To clean the walls enclosing courts and shafts made of a light-colored brick or stone.
c. This section does not apply to:
(1) Outer courts which open on a street; or
(2) Courts which exceed the minimum dimensions set forth in section twenty-six of the multiple dwelling law by at least fifty percent.