Selective defocus is a tool for emphasis and contrast. Shooting in January gave several advantages; the sun was quite low and the sky offered a similar range of tones to the beach, while the tilts and swings made it possible to isolate the tower yet further. The film brand is Chinese, the lens is German, but the Neretta Rail camera was designed and constructed in Wales.
Perspective distortion can do great disservice to architecture, which is one of the reasons camera movements are a necessity when photographing large buildings. You generally don't want parallel verticals to converge or significant planes to be out of focus. However, you also want to make the setting as interesting as the building itself, and playing with focus can sometimes help.