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Why do these buildings go so deep? Above ground construction is cheaper and faster.
It's mostly about parking space and the fact that you have no restrictions for underground construction, as it's officially not a building - it can be used as storage and place for all kinds of infrastructure.
Getting a new parcel for parking itself is expensive and time consuming. Above-ground levels of that kind can quickly eat up space and make the building reach its designed height quickly.
All in all, it's all about the money - the more you can squeeze out of that lot, the better.
 

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insertoronto
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Yep, almost all new buildings in Toronto stick their parking underground. It also has to do with the fact that bedrock is really shallow in Toronto (You can see it where the wood ends in the Shangri la pics posted above), which means it is cheaper to dig down to bedrock and then build up than it is to put down thousands of piles to support the building.
 

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Journeyman
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Every new building in Seattle has a deep excavation, unless there's no parking. Particularly with the new stricter rules limiting above-grade parking. Excavations like those shown are just typical.

This can be challenging, as sometimes it means building below the water table, which is expensive.
 

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Petronas Towers' foundation is 120 meter deep.



Because of the depth of the bedrock, the buildings were built on the world's deepest foundations.[9] 104 concrete piles, ranging from 60 to 114 metres (200 to 374 ft) deep, were bored into the ground. The concrete raft foundation, comprising 13,200 cubic metres (470,000 cu ft) of concrete was continuously poured through a period of 54 hours for each tower. The raft is 4.6 metres (15 ft) thick, weighs 32,500 tonnes (35,800 tons) and held the world record for the largest concrete pour until 2007.[8] The foundations were completed within 12 months by Bachy Soletanche and required massive amounts of concrete.
 

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Que paza!!!
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I know there's a parking building in La Coruña, Spain, 10 floors / 45m deep, and another one 11 floors deep in Barcelona.

Pics from the construction in La Coruña

El aparcamiento del Papagayo parece que casí llegará a los 45 metros de profundid. Son diez plantas de parking en una zona con edificios relativamente antiguos, justo en medio de la península de A Coruña.







Also, Burgo's Castle, built in the middle age, has a 63.5 metres deep accesible well, here's a model:

Por otra parte, el pozo del Castillo de Burgos, de construcción medieval, tiene 63,5 m de profundidad, y es una magnífica obra de ingeniería, con una serie de escaleras de caracol separadas en husillos que llega hasta su base.

Foto que saqué el otro día:


Y un par de fotos de la maqueta que tienen allí. Atención a la escala de las personas y a la complejidad de la escalera.

 
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