150 meters
= 45 floors
@ 10 feet / story
If the horizon crests at ~25 miles at sea level here on earth, what's the distance from which it can be seen. I think that's a relevant measure for the effect of a building on its surrounding community.
Though your measure of effect on the surrounding community wouldn't really apply here as the buildings aren't that tall when compared to surrounding mountains.
Anything else requires some napkin math about the circumfrence of the earth and radial offsets for non-sea-level terrain, combine with a bit of triangulation, to estimate skyline impact. Then, heaped on top is the effects of local topography contours and relative relationships with other human structures.