In the first webinar today I mentioned using lens Correction while editing images with buildings, it really does go a long way.
Here is an example of a before and after
As you see in the first image, the grid lines done line up with the house lines.
In this Second one the house Is straightened out.
So in case you don't know how to do this, I would use Lightroom as it is the easiest way to accomplish this.
You'll want to be under manual for the lens correction. You always want to start with the center of the image. So to line up the center you simple rotate the image so the center line is in line with the center of the image.
From there you go to the vertical distortion. So if you did the center alignment right, both sides should either appear to be falling away from you or leaning towards you. Adjust this with the vertical.
The distortion slider is if your image looks like it is bubbling out or in.
This would be bubbling out and you would want to pull the distortion so that the side lines are straight up and down
The above is a web image so I apologize, but you get the point?
If you'd like to adjust horizontal only do this after everything else is in line. It won't adjust correctly if you haven't finished the rest of the lens correction.
If anybody has any questions feel free to DM me. I used to do this on a daily basis at my last job for the past three years working with real estate images