Just a quick note, while ethereal unless someone constructed walls of force somewhere or physically moved obstacles onto the ethereal plane (such as walls, blocks, stones, planks, etc), you are entirely free to move in any direction by walking in that direction ("walking" straight up and down is entirely possible, though all movement is at half speed on the ethereal plane), even through walls and floors/ceilings on the material planes. So you could literally fly upwards and see exactly where the building is.<br/><br/>Also remember that you lose your DR and flight while in human shape, as they are Extraordinary abilities (and thus are lost when using Change Shape).