I like them all...though I think #2 is great ( I to enjoy shootingarchitecture) the angle at the base appears off a bit....that was my initial impression. Nice work!
I really like the second of this series. I like that one best of all! The lines and overall composition and the building as such and that little pyramid and the sky .... good!
The atmosphere and colour in the last are also very appealing, but since there is a bit of detail to be seen in the dark parts (you did not go for a full silhouette there), I would now wish to see just a tad more...