The Archerās Tower building does not always light up when hovering with the cursor, not even clickable. Itās more likely to light up when you hover on the margins of the building.
What exactly did you do to trigger it?
Hover the Archerās Tower in Castle view.
A screenshot or video would be fantastic.
The Print Screen cuts the cursor out, so i cannot provide a proof.
Itās a known problem, likely caused by improper potrace result for several buildingsā outlines (interested people can look into databank/bmp2shape.php).