Length of the rectangular building = 7 feet
Width of the rectangular building = 5 feet
Now, The building is made with a scale factor of 12
So, Actual length of the rectangular building = 7*12=84 feet
Actual width of the rectangular building = 5*12= 60 feet
Now, Actual area of the rectangular building = Length × Width
So, finally we get that actual area of the rectangular building = 84 × 60=5040 , so the correct answer is option D.