10. One Madison, New YorK | Average price per square foot: $5,000 | Penthouse: $43 million | Agent: The Related Companies | Located on East 23rd Street in Manhattan, this slim 60-story glass tower has 53 units with amenities such as an indoor pool with marble walls and butler service. It was designed by the architecture firm CetraRuddy.
9. One Thousand Museum Condos, Miami | Average price per square foot: $1,100 | Penthouse: $45 million | Agent: Savills | Designed by Pritzker Prize-winning Iraqi-British architect Zaha Hadid, this building at 1000 Biscayne Boulevard is billed as “creating a six star lifestyle.”
8. Clermont Residence, Singapore | Average price per square foot: $2,360 | Penthouse: $47 million | Agent: Savills | Clermont Residence is perched atop the 951-foot-high Tanjong Pagar Centre, Singapore’s tallest building. Skidmore, Owings and Merrill designed the building. There are 180 apartments, including the 14,500-square-foot penthouse with its own private elevator.
7. 56 Leonard, New York | Average price per square foot: $6,000 | Penthouse: $47 million | Agent: Corcoran Sunshine Marketing Group | This Herzog & de Meuron-designed tower in Tribeca is almost entirely made from cantilevered glass, offering city views through floor-to-ceiling windows.
6. Opus Hong Kong, Hong Kong | Average price per square foot: $10,740 | Top published price: $58.6 million | Agent: Swire Properties | Pritzker-winning Canadian architect Frank Gehry designed the 12-story Opus development, his first residential project in Asia. Located at the exclusive 53 Stubbs Road on the Peak, the building’s eighth floor apartment has already broken records as the most expensive ever sold in the city.

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5. Tour Odéon, Monaco | Average price per square foot: $8,900 | Top apartment: $65.7 million | Agent: Knight Frank | At more than 550 feet, Tour Odéon will be the tallest building in Monaco, overlooking the entire principality and the Mediterranean sea. Architect Alexandre Giraldi and Monegasque family-run developer Groupe Marzocco collaborated on the creation of the landmark, bringing in designer Alberto Pinto for the interiors and Jean Mus to create the gardens.
4. South Bank Tower, London | Average price per square foot: $3,300 | Penthouse: $90 million, asking price | Agents: Savills and CBRE | South Bank Tower was originally a 30-story structure designed by Sir Richard Seifert in 1972. Developer CIT recently acquired the building, and brought in Kohn Pedersen Fox Associates to redesign it, with interior design from Johnson Naylor.
3. One57, New York | Average price per square foot: $6,000 | Penthouse: $90 million (sold in 2012) | Agent: One57 | Rising 1,004 feet over Midtown Manhattan on 57th Street, this development is the tallest residential building in New York. Developed by Gary Barnett’s Extell.
2. 432 Park Avenue, New York | Average price per square foot: $6,742 | Penthouse: $95 million | Agent: Macklowe Properties | A Midtown Manhattan neighbor of One57, 432 Park Avenue is the brainchild of property tycoon Harry Macklowe. It was designed by architect Rafael Viñoly, with interiors by Deborah Berke.
1. One Hyde Park, London | Average price per square foot: $9,906 | Penthouse: $227 million | Agents: Savills, Aylesford, Strutt & Parker | The signature development of the Candy brothers, One Hyde Park, though not a skyscraper, is probably London’s most hotly-discussed residential building, according to Wealth-X.

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The prices for luxury apartments in city centers are soaring, and so too are their locations.

Property developers around the world are wooing mega-wealthy buyers with lavishly appointed skyscrapers in the most prestigious of neighborhoods, where large-scale lateral square footage is nearly impossible to find, according to a recent article in Wealth-X.

“Wealthy buyers want convenience,” Joanna Leverett, head of international new developments at Savills, told Wealth-X.

“Flagship developments provide services and facilities such as spas, wellness and restaurants that you wouldn’t normally get in a house, all within walking distance to the city’s restaurants and culture instead of being out in the sticks.”

These trophy residences are being designed by top architects and interior designers, and have the added benefit of being zero-maintenance, turnkey properties.

(Check out: Top 10 Most Ridiculous Luxury Items: 2013)

This type of apartment is easier on the rent and resale market too, said Edward de Mallet Morgan, head of super prime international property at Knight Frank. “More owners are renting out their properties where there is a good management, rental service or a concierge, as it is nice to have some income being generated to put towards annual running costs,” he said.

Following is the Top 10 most expensive luxury penthouses on the world, and the developers behind them.

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