LIGHTING
Lighting is a crucial part of architectural photography. Of course we have no say over the position and orientation of a building,
Side-front lighting usually produces the best architecture photos. It provides plenty of illumination and also casts long, interesting shadows across the face of the building, making its surface details stand out and giving the building a more three-dimensional look.
Back lighting is the worst kind for architectural photography because it creates very uniform, dark surfaces. The best way to deal with a backlit building is to either crop out the sky and use a longer exposure to rescue some of the detail, or photograph the building as a silhouette. Alternatively you could wait until it gets dark...