From how far away can the Empire State building be seen?

Question

If one were to be standing on the ground, what would be the maximum distance you could still see the Empire State building?

Explain your reasoning.

Answer 1

In its entirety or only the top?

A 6ft person will see the Earth horizon at out 3 mi.
Likewise, the top (http://en.wikipedia.org/wiki/Empire_state_building) of the Empire State Building is 1454 ft, so its horizon is ~47 miles.

Therefore, maximum distance that a 6 ft person can see the top of the Empire State Building is ~50 miles on a round Earth with radius 6378.14 km (http://en.wikipedia.org/wiki/Earth).

If you're asking far can someone see an object that big, visual acuity is about 1 minute of arc, so the building will appear as a visible dot at about 946 miles.