First make sure you're in 3D mode. Then click on Add a Placemark. Hold your cursor over the object you wish to measure. The mechanical room of FCP shows me 369 metres above sea level, down at the very bottom right. Move the cursor a little bit to show the height of the main roof. It shows me 363 metres above sea level. That means the Mech. is 6 metres high. Then move your cursor a bit more so it shows the height of the sidewalk beside the tower. This shows me 78 metres above sea level. A quick calculation shows an overall height of 291 metres. That's close enough for a non-expert like myself to say that FCP isn't 298 metres...