When looking to move apartment, some of us place too much emphasis on the orientation of the building and the unit, for instance, which direction the main door of the building and the front door of your flat face. To focus on these qualities is detrimental as the influence of structures in fung shui outweighs the influence of direction.
To assess an apartment building, you should look at its immediate environment. It should not be the only building in the area, otherwise occupants will feel lonely. It also should not be the tallest building in the area to the extent that it clearly towers over the rest, or else occupants will be vulnerable to mishaps. On the other hand, your building should also not be dwarfed or overwhelmed by the surrounding buildings, otherwise you will find yourself being taken advantage of in your personal and professional life. Thus, it is best to live in a building that is similar in height to most of the buildings in the immediate vicinity.
It is preferable that the building immediately behind you is slightly higher so that it will support your back and confer a degree of protection to your building. The one immediately in front of yours should be slightly lower so it does not obscure your view, but instead allows the energy to settle and congregate in front of you.