The slender skyscrapers changing New York's skyline

The Empire State Building, the Art Deco Chrysler Building, the super-tall One World Trade Center. New York City is ho...

Posted: Feb 13, 2018 8:55 AM
Updated: Feb 13, 2018 8:55 AM

The Empire State Building, the Art Deco Chrysler Building, the super-tall One World Trade Center. New York City is home to some of the world's most iconic skyscrapers.

But the buildings entering its famous skyline today are doing something unusual. They're getting skinnier.

Take The Steinway Tower at 111 West 57th Street. Upon completion in 2019, the 1,428-foot-tall (435-meter-tall) building in Midtown Manhattan will not only offer unobstructed views of Central Park, it will also be the slenderest skyscraper in the world, with a width-to-height ratio of 1:24.

Russia, meanwhile, is building its first supertall skinny skyscraper also in Midtown. Moscow-based developer Meganom's "shelves in the air" will top out at 1,001 feet (305 meters) at 262 Fifth Avenue and boast a slenderness ratio of 1:20.

Both buildings are part of a tribe of slender climbers sticking their skinny necks into the city's architectural conversation.

What is a slender skyscraper?

Slenderness is not in the eye of the beholder when it comes to skyscrapers, at least. In this field, it is a technical engineering term. Whether it can be applied to a building is determined by the structure's base width to height ratio, according to Carol Willis, an architectural historian and founder of the Skyscraper Museum in New York City.

"Structural engineers generally consider skyscrapers with a minimum 1:10 or 1:12 ratio to be slender," Willis says.

In 2013/2014, the Skyscraper Museum museum presented its "Sky High & the Logic of Luxury" exhibition, documenting the rise of skinny structures in Manhattan. Slender buildings featured in the show included the 1,396-foot-tall (425.5-meter-tall) 432 Park Avenue; One57 aka "The Billionaire Building;" and the distinctive "stacked homes" 56 Leonard tower.

"New York's slender buildings are unique as a development in skyscraper history -- they're different to simply tall buildings," Willis says, adding that when deciding which skyscrapers to include in the show her team "accepted the slenderness ratios provided by their engineers."

Determining a building's slenderness ratio is often not a precise science, she cautioned: "Exact slenderness ratios are difficult to calculate because the bases and shafts are often very different widths as the buildings rise."

Why slim down?

So when did developers start slimming down their skyscrapers -- and why?

Willis says the "engineering and development strategies of slenderness were first seen in around 2007." She pinpoints luxury residential condominiums One Madison Park, on Broadway and Park Avenue, and Sky House, between Fifth Avenue and Madison Avenue, as the first "slenders" to have cropped up in New York.

Complex zoning laws in the city were a motivating factor, Willis explains. While such regulations restrict the amount of land that can be built on within an area, a loophole allows for the transference of "air rights" from one plot to another. So developers could buy a small parcel of land, then buy air rights from adjacent plots and stack these to gain permission to build a tall tower. For example, if an existing building is shorter than its maximum allowed height then the developer of a new adjacent property could purchase the unused air rights, and stack them to the air rights of their existing plot -- such a transaction is called a "zoning lot merger."

Technological advancements also contributed to the rise of the skinnies.

"Over the past decade, advances in materials and engineering have made building 'supertalls' possible, specifically those with smaller footprints," says Jonathan Miller, president and CEO of New York real estate consultancy Miller Samuel. Towers between 980 feet (300 meters) and 2,000 feet (600 meters) high fall into the "supertall" category.

Standing out from the crowd

While developers typically strive primarily for return on investment, they often also want to create a structure unique enough to get the market's attention, says Miller. Slender designs, which come in all shapes and sizes, tick that box.

Take 111 Murray Street, in Tribeca, which will feature a curved, glass exterior and boast access to luxurious amenities including a concierge private jet service. Or 125 Greenwich Street, designed by award-winning architect Rafael Vi-oly, which will be split into three glass prisms with landscaped gardens separating them. Meanwhile, the 800-foot-tall (244-meter-tall) 130 William tower in lower Manhattan, by architect David Adjaye, will forgo a glass fa-ade altogether in favor of stone and masonry, materials that pay homage to the history of the street it's located on.

"They are competing with other developers to stand out. The stakes are high financially, so design becomes a big part of the effort," says Miller.

Tall, skinny and good looking

Though the slenderness of a building is not defined by its height, slender towers do tend to be tall -- the "runway models" of the real estate world.

"Out of my window I can see one of these slender towers, which is 60 stories tall," Willis says. "The 30 stories at the top have an uninterrupted view of the skyline. So you're just setting the bar higher ... raising someone's neck, head and eyes above a crowd. "It lends a level of prestige that people are willing to pay additional money for."

Miller agrees. "In many cases this new generation are nearly twice as tall as the prior generation, going from 50 stories to nearly 100 stories, yet sitting on a much smaller footprint."

Supertall slenders can increase the desirability of their neighborhoods. "As a new class of building, they are not always in (traditionally) premier locations -- in fact, their tallness is often used to 'blaze a trail' in an untested residential location," says Miller.

He cites "Billionaires' Row", on 57th Street in Manhattan -- home to many slenders -- as an example.

"It is the central business district and (previously) not known for residential luxury buildings. The introduction of supertalls helped this location morph into a new identity as 'Billionaires' Row.'"

Setting an example?

New York is not the only place with a taste for slender skyscrapers.

In 2003, the 828-foot-tall (252-meter-tall), 75-story luxury residential tower Highcliff was opened in Hong Kong -- a city that, along with New York, has one of the most expensive real estate markets in the world, and a distinct lack of space on which to build. Highcliff has a slenderness ratio of 1:20. Upon completion, its developers claimed it was the slenderest residential property in the world.

Meanwhile, the 73-story Elysium Melbourne -- which measures just 12 meters wide at its narrowest point -- is set to become that Australian city's tallest and slimmest building. Its construction has been approved, although the completion date has yet to be confirmed.

In Sao Paulo, Brazil, AIR Madalena is a decidedly skinny residential property -- the 12 story building has a fa-ade that is narrower than the average single-car garage.

It remains to be seen how long skinny stays in style.

Minnesota Coronavirus Cases

Data is updated nightly.

Confirmed Cases: 97638

Reported Deaths: 2067
CountyConfirmedDeaths
Hennepin27372932
Ramsey11088322
Dakota7635126
Anoka6238137
Stearns407724
Washington388355
Scott262533
Olmsted251928
Nobles197716
Blue Earth17266
Wright16957
St. Louis165941
Carver14377
Clay141741
Rice13438
Mower13425
Sherburne116914
Kandiyohi10552
Winona91318
Lyon7224
Waseca6898
Benton5603
Crow Wing55518
Steele5552
Freeborn5464
Nicollet54517
Watonwan5304
Chisago5131
Todd5042
McLeod5012
Le Sueur4744
Otter Tail4624
Beltrami4505
Martin43010
Goodhue3829
Itasca34715
Pine3430
Douglas3372
Polk3224
Isanti3151
Becker2812
Carlton2761
Morrison2682
Dodge2570
Pipestone23210
Cottonwood2280
Chippewa2231
Meeker2132
Wabasha2020
Sibley1993
Brown1962
Yellow Medicine1902
Cass1844
Redwood1773
Rock1760
Murray1722
Mille Lacs1693
Renville1578
Unassigned15452
Jackson1491
Faribault1470
Swift1441
Fillmore1330
Houston1280
Kanabec1278
Roseau1250
Koochiching1233
Pennington1201
Hubbard1171
Lincoln1160
Stevens1041
Pope990
Aitkin831
Big Stone830
Wadena720
Wilkin703
Lac qui Parle651
Grant634
Lake600
Norman540
Marshall531
Mahnomen491
Red Lake451
Traverse340
Clearwater280
Lake of the Woods231
Kittson120
Cook60

Iowa Coronavirus Cases

Data is updated nightly.

Confirmed Cases: 86860

Reported Deaths: 1315
CountyConfirmedDeaths
Polk16010262
Woodbury555467
Johnson517027
Black Hawk450990
Linn4101113
Story346217
Dubuque333241
Scott304528
Dallas280738
Pottawattamie215939
Buena Vista199912
Marshall179134
Sioux16803
Wapello134057
Webster128014
Plymouth116121
Clinton113021
Muscatine112155
Crawford11005
Cerro Gordo105921
Warren9666
Jasper86432
Des Moines8008
Marion7697
Henry7554
Tama73932
Carroll6855
Lee6437
Wright5961
Dickinson5306
Boone5178
Bremer5027
Washington47211
Louisa43115
Delaware4233
Mahaska41519
Floyd3543
Jackson3523
Franklin35118
Lyon3514
Winneshiek3406
Clay3344
Hamilton3323
Benton3281
Winnebago31713
Hardin3071
Poweshiek3078
Buchanan2861
Jones2843
Kossuth2800
Butler2752
Emmet27010
Clarke2683
Shelby2681
Allamakee2666
Chickasaw2661
Sac2650
Clayton2633
Cherokee2552
Cedar2521
Guthrie2527
Harrison2523
Fayette2312
Madison2272
Grundy2243
Iowa2161
Palo Alto2050
Hancock1952
Howard1927
Humboldt1913
Mitchell1910
Calhoun1873
Mills1831
Page1710
Cass1692
Osceola1690
Pocahontas1652
Monona1601
Monroe16011
Lucas1566
Appanoose1423
Jefferson1391
Union1383
Taylor1321
Davis1274
Ida1261
Fremont1210
Van Buren1151
Keokuk1141
Worth1090
Greene1030
Montgomery975
Audubon871
Wayne872
Adair721
Decatur670
Ringgold532
Adams330
Unassigned140
Rochester
Clear
47° wxIcon
Hi: 61° Lo: 47°
Feels Like: 43°
Mason City
Overcast
56° wxIcon
Hi: 64° Lo: 49°
Feels Like: 56°
Albert Lea
Overcast
55° wxIcon
Hi: 64° Lo: 49°
Feels Like: 55°
Austin
Broken Clouds
50° wxIcon
Hi: 62° Lo: 48°
Feels Like: 50°
Charles City
Overcast
52° wxIcon
Hi: 63° Lo: 44°
Feels Like: 52°
Winds pick up for Wednesday
KIMT Radar
KIMT Eye in the sky

Community Events