We can measure the distance to the moon accurately enough to determine it is getting 3.8 cm furhter from the earth each year, I'm pretty sure 10cm is well outside the margin of error for measurements of something as simple as a building.
Once you know what to measure, that is true. However, in 'tallest of the world' attempts, there typically is quite a bit of uncertainty about where spires (included in height measurement) end and antennae (not part of the building) begin (http://en.wikipedia.org/wiki/List_of_tallest_buildings_and_s...).
