parasite building
n. A small building or structure that has been added to an existing, larger building, particularly when the styles of the two structures are noticeably different. Also: parasite, parasite structure, parasite office.

Example Citations:
Small-scale densification: Alternatives such as tiny laneway houses and ‘parasite’ buildings are popping up in lieu of big-box condos.
—Tamsin McMahon, “The (literal) rise of the anti-condo,” Maclean’s (Canada), July 9, 2014

The interplay of new and old varies greatly from a totalizing wrap (Enric Miralles’s Santa Caterina Market in Barcelona, blanketed by a roof of colorful tiles) to an opportunistic parasite (the glass ribbon grafted onto a fire and police station in Berlin by Sauerbruch Hutton). Even within the same category, differences emerge: One parasite-building surrounds and hides its host, while another, the 100-square-foot Rucksack House, perches lightly on the side of any host-building from which it’s slung.
—Amanda Kolson Hurley, “Past Perfect,” Architect, December 19, 2013

Earliest Citation:
Charlie Luxton wants to buck the system and solve Britain’s housing crisis. His answer? A modified shipping container fitted out as a mini-home that he tries out in different locations over the next four nights. Tonight he puts it on a rooftop, and visits other successful “parasite buildings” here and abroad.
—Steve Rose and Phelim O‘Neill, “Pick of the day,” The Guardian (London), September 4, 2004

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