Great to see you understanding the impacts of the different colours in a photo and how the different light metering methods can adjust the colours and tones Anne. With more practice you'll be able to see the colours in a scene and know whether you need to over or under expose a photo without have to change from pattern metering.
I think your issue with straightening isn't actually an issue

The perspective you have makes all the vertical lines not actually be straight up (call it a perspective distortion issue). With the shots that you've taken of the building straight on, just work on making sure the horizontal lines are, well, horizontal, and ignore the vertical lines. If it still seems off, it will be just the vertical lines making the photo appear out of balance. You might be able to crop the photo in certain places to make it feel more balanced.
Hope this helps!
Cheers,
Mal