The two main forms of buildings' deformations are tilt and settlement. The
main sources of these deformations are wind, vibration, moving traffic, and
foundations' movement caused by either total or differential settlement. The shape and
deformation of an object vertical plane which represent the building facade can determined
knowing the space coordinates of a group of points which are well distributed on the
required building facade. The space coordinates of these pomts can be determined using
surveying, photogranmietric,or combined technique. The required measurements are the
horizontal and the vertical directions to each of these objects points from a two theodolite
stations setting at a suitable location relative to the object vertical plane. This article gives
the best location of the two theodolite stations to obtain thie required coordinates with
minimum errors