Over the past year, an entirely new building typology has materialized: that of the super-tall, impossibly-skinny, and ultra-extravagant residential condo tower. Each month a new design by a famous architect seemed to tout the privileged city views made possible by towering heights and even more impressive finances. Replete with luxury amenities, new technologies, and floor-to-ceiling windows, renderings for buildings such as One57 and 432 Park Avenue in New York provided mouthwatering previews of some of the world's most exclusive real estate.

With so many opulent condo proposals featuring staggeringly-high price tags, we've created a visual list that puts a façade to the extravagance. But be forewarned, the following compilation of multi-million dollar penthouses with luxury amenities such as private pet grooming studios and interiors by world-renowned designers is enough to make your mouth drop. Which makes us wonder, is this trend for ultra-premier apartments merely a phenomenon of the times, or here to stay? See for yourself

One Hyde Park by Rogers Stirk Harbour + Partners, London

Average Price Per Square Foot: US $9,906 Penthouse: US $226.9 million

A major project between luxury real estate developers Christian and Nick Candy along with the former Prime Minister of Qatar, Rogers Stirk Harbour + Partners' modernist-inspired One Hyde Park is perhaps London's most widely publicized residential building—and not because of the architecture. With ultra-opulent interiors designed as if they were plucked from an oil tycoon's wildest fantasy, residential units start out at an astounding £20 million. Rinat Akhmetov, a Ukranian business oligarch, bought a penthouse for an unthinkable £140 million — a shameless display of wealth that led even its investment bankers to declare "One Hyde Park is a symbol of the times, a symbol of the disconnect."

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432 Park Avenue by Rafael Viñoly, New York City

Average Price Per Square Foot: US $6,742 Penthouse: US $95 million

Although not set to be finished until 2015, the penthouse on top of Rafael Viñoly's towering 432 Park Avenue condo building is already set to fetch $95 million. Standing at 1,398 feet, the supermodel-like structure will be the tallest residential building in the city, giving its ultra wealthy tenants perhaps the most stellar private views in the city. The penthouse alone will boast six bedrooms, seven bathrooms, and a library in addition to the building's wine cellar, 75-foot indoor swimming pool, and spa—in case you don't feel like interacting with the rest of the city.

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One57 by Christian de Portzamparc, New York City

Average Price Per Square Foot: US $6,000 Penthouse: US $90 million

Designed by the Pritzker Prize-winning French architect Christian de Portzamparc, with interiors by Danish designer Thomas Juul-Hansen, the soon-to-be-complete One57 on Manhattan's 57th Street claims to be a "vertical billionaire's row," with the penthouse selling for $90 million in 2012. Aside from the immodest luxury tower's staggering prices and "basic" amenities such a private yoga studio, arts and crafts atelier, and pet grooming room, One57 became the subject of numerous headlines when one of the construction cranes collapsed during Hurricane Sandy, causing numerous disruptions and evacuations of neighboring buildings—which local residents described as symbolic of the explicit disparities between the tower and surrounding neighborhood.

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South Bank Tower by Kohn Pedersen Fox (redesign), London

Average Price Per Square Foot: US $3,300 Penthouse: US $90 million

Originally a 30-story structure designed by Sir Richard Seifert, London's South Bank Tower—which is set to be complete in 2015—was acquired by developer CIT and redesigned by Kohn Pedersen Fox Associates, with interiors by Johnson Naylor. Soon, 191 luxury apartments will compose the 41-story building on the banks of the Thames. With uninterrupted views of the London Eye and city below, the triplex penthouse, which includes two roof decks, has an asking price of $90 million.

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Tour Odéon by Alexandre Giraldi, Monaco

Average Price Per Square Foot: US $8,900 Top Apartment: US $65.7 million

With its reputation as a tax haven for the rich, it's no surprise to see some of the priciest pieces of real estate in Monaco. A collaboration between Belle Epoque architect Alexandre Giraldi and Monegasque family-run developer Groupe Marzocco, the Tour Odéon will feature a "sky penthouse" covering 35,500-square-feet of the building's top five floors. With a water-slide flowing directly into a private infinity pool, and interiors by designer Alberto Pinto, the penthouse is reportedly set to cost an entirely reasonable $387 million, which would make it the most expensive apartment in the world.

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