Answer: If Luna is making the model of the Empire State Building at a scale of 1 foot to 250 feet, we can determine the height of her model by multiplying the height of the actual building by the scale factor.
Height of the model = Height of the actual building * Scale factor
Given that the height of the actual Empire State Building is 1250 feet, and the scale factor is 1 foot to 250 feet, we can calculate the height of Luna's model as follows:
Height of the model = 1250 feet * (1/250) = 5 feet
Therefore, Luna's model of the Empire State Building will be 5 feet tall.