We know that the ratio is going to be model:building. Another way I would write this is model/building. In this case, the model is 24 inches and the building is 1,454 feet tall. That makes our ratio 24 inches/ 1,454 feet. We can then reduce it like a fraction, making it 12/727, or 12:727.
We need to deal in the same units.....24 inches = 2 ft....so....
2 ft : 1454 ft =
1 ft : 727 ft =
1 : 727
This is VERY nearly identical to a question you asked yesterday with the Statue of Liberty.....why don't YOU try to answer it and tell us what you find....then we can help YOU LEARN how to do your homework !!! OK???