Skyline Killers: those wretched buildings that (partially) wreck the skyline.
Most often, you see them on the waterfront. Hence their killer ability, as they cannot be easily covered up without land reclamation in front of these skyline killers.
Prototypical exemplars:
Toronto's Harbour Castle and adjacent fugly concrete monstrosities (to the left), right on the waterfront, which act like a wall, Kowloonian-style.
tripadvisor
Toronto's skyline has transformed over the past twenty years, but those fuglies still mar the waterfront.
images c/o BlogTO
Lower Manhattan. You know which buildings I am talking about. Those fugly hulking things, to the right, on the waterfront. Blocking the view of the lovely lower Manhattan beauties from the 1920s/30s.
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poo
Montreal: Palais de Justice. Rising like some dystopian monolith from the otherwise lovely Vieux Montreal.
laPresse