Buildings are as hard to frame as trees, I think. Maybe harder. You can look at a building day-in, day-out and think that you love it (or hate it) but to frame it in a way that shows other people what you’re seeing is incredibly difficult.
Not the least because if it’s iconic, there are people who spend a lot of effort showing you the iconic view of the structure—the one that rouses memory and sentiment. But that’s often not what stirs the heart, really, as you walk around and move within a structure you depend upon and love.
Or what enlivens your gaze, showing you a building from somewhere new. I think that’s really the trick of it: the architectural photographer needs to be somewhere that people often aren’t, to frame something they don’t often see. A wide-angle shot. A feature on a structure, isolated. Higher up or lower down. A building under clouds, wreathed in snow. Two buildings together. A street in procession. A glimpse into the interior from a place well outside.