Sam Altman has an interesting post up on his blog talking about what he feels is a changing cultural environment in San Francisco (which is where he is based). His argument is that heresies are good for innovation and for moving the world forward. We need people to question established norms. But for that to happen we need environments and cities that encourage it, or at the very least allow it.
Here’s an excerpt:
Restricting speech leads to restricting ideas and therefore restricted innovation—the most successful societies have generally been the most open ones. Usually mainstream ideas are right and heterodox ideas are wrong, but the true and unpopular ideas are what drive the world forward. Also, smart people tend to have an allergic reaction to the restriction of ideas, and I’m now seeing many of the smartest people I know move elsewhere.
In San Francisco he is starting to feel that it is becoming increasingly difficult to have wacky ideas and to work on wacky startups. And for this reason, people are starting to leave the city in search of more open cultures. Openness used to be a hallmark of San Francisco. It was once the epicenter of counterculture. Has that changed?
Sam Altman has an interesting post up on his blog talking about what he feels is a changing cultural environment in San Francisco (which is where he is based). His argument is that heresies are good for innovation and for moving the world forward. We need people to question established norms. But for that to happen we need environments and cities that encourage it, or at the very least allow it.
Here’s an excerpt:
Restricting speech leads to restricting ideas and therefore restricted innovation—the most successful societies have generally been the most open ones. Usually mainstream ideas are right and heterodox ideas are wrong, but the true and unpopular ideas are what drive the world forward. Also, smart people tend to have an allergic reaction to the restriction of ideas, and I’m now seeing many of the smartest people I know move elsewhere.
In San Francisco he is starting to feel that it is becoming increasingly difficult to have wacky ideas and to work on wacky startups. And for this reason, people are starting to leave the city in search of more open cultures. Openness used to be a hallmark of San Francisco. It was once the epicenter of counterculture. Has that changed?
Here is a final excerpt:
I don’t know who Satoshi is, but I’m skeptical that he, she, or they would have been able to come up with the idea for bitcoin immersed in the current culture of San Francisco—it would have seemed too crazy and too dangerous, with too many ways to go wrong. If SpaceX started in San Francisco in 2017, I assume they would have been attacked for focusing on problems of the 1%, or for doing something the government had already decided was too hard. I can picture Galileo looking up at the sky and whispering “E pur si muove” here today.
The latest data from the American Community Survey (2012 to 2016) has placed the suburban and exurban share of the US population (53 major metropolitan areas) at 85.5%. Back in 2000 this number was thought to be around 83.5%.
Since 2010, automobile oriented suburbs and exurbs have also accounted for 90.5% of population growth. The US – and Canada would be no different – is by and large a suburban nation. And the data suggests this isn’t about to change.
The one exception is the New York metro area. From 2012 to 2016, 74% of its growth happened in the urban core. No other major metropolitan area in the US comes close to this sort of urbanity. Below is a chart from New Geography that shows you how NYC compares.
Alexis C. Madrigal recently published a piece about the Salesforce Tower in San Francisco called: The Tower at the Heart of the Tech Boom. At 61 floors and 1,070 feet, it is now the tallest building in San Francisco and the second tallest building west of the Mississippi River after the Wilshire Grand Center in Los Angeles.
Hines and Boston Properties are the developers of the building. Pelli Clarke Pelli is the architect. And Salesforce is the anchor tenant. In April 2014, it was announced that they had leased 714,000 sf on floors 1, 3-30, and 61. (Get that top floor.) So almost half of the building.
Perhaps not surprisingly, Madrigal calls the Salesforce Tower the “the most visible monument to the industry [tech] in the region and the country.” It is a demonstration of the power and reach of Silicon Valley. San Francisco has a new symbol. The TransAmerica Pyramid now feels inadequate.
Though interesting, this is actually not what I want to talk about today. I’d like to talk about what it took to build such a tall building in a seismically active city like San Francisco. Unfortunately, this feels timely given that the sinking Millennium Tower is getting so much attention right now.
The structural engineer for the Salesforce tower is Seattle-based Magnusson Klemencic Associates (MKA). They are a world-renowned structural and civil engineering firm that have been around since the 1920s. Other projects they are currently working on include the third tallest building in Chicago.
The tower’s seismic force-resisting system is made up of reinforced concrete shear walls that surround the central elevator and exit stair core. These walls are 24 to 48 inches thick. Here is a plan taken from
Here is a final excerpt:
I don’t know who Satoshi is, but I’m skeptical that he, she, or they would have been able to come up with the idea for bitcoin immersed in the current culture of San Francisco—it would have seemed too crazy and too dangerous, with too many ways to go wrong. If SpaceX started in San Francisco in 2017, I assume they would have been attacked for focusing on problems of the 1%, or for doing something the government had already decided was too hard. I can picture Galileo looking up at the sky and whispering “E pur si muove” here today.
The latest data from the American Community Survey (2012 to 2016) has placed the suburban and exurban share of the US population (53 major metropolitan areas) at 85.5%. Back in 2000 this number was thought to be around 83.5%.
Since 2010, automobile oriented suburbs and exurbs have also accounted for 90.5% of population growth. The US – and Canada would be no different – is by and large a suburban nation. And the data suggests this isn’t about to change.
The one exception is the New York metro area. From 2012 to 2016, 74% of its growth happened in the urban core. No other major metropolitan area in the US comes close to this sort of urbanity. Below is a chart from New Geography that shows you how NYC compares.
Alexis C. Madrigal recently published a piece about the Salesforce Tower in San Francisco called: The Tower at the Heart of the Tech Boom. At 61 floors and 1,070 feet, it is now the tallest building in San Francisco and the second tallest building west of the Mississippi River after the Wilshire Grand Center in Los Angeles.
Hines and Boston Properties are the developers of the building. Pelli Clarke Pelli is the architect. And Salesforce is the anchor tenant. In April 2014, it was announced that they had leased 714,000 sf on floors 1, 3-30, and 61. (Get that top floor.) So almost half of the building.
Perhaps not surprisingly, Madrigal calls the Salesforce Tower the “the most visible monument to the industry [tech] in the region and the country.” It is a demonstration of the power and reach of Silicon Valley. San Francisco has a new symbol. The TransAmerica Pyramid now feels inadequate.
Though interesting, this is actually not what I want to talk about today. I’d like to talk about what it took to build such a tall building in a seismically active city like San Francisco. Unfortunately, this feels timely given that the sinking Millennium Tower is getting so much attention right now.
The structural engineer for the Salesforce tower is Seattle-based Magnusson Klemencic Associates (MKA). They are a world-renowned structural and civil engineering firm that have been around since the 1920s. Other projects they are currently working on include the third tallest building in Chicago.
The tower’s seismic force-resisting system is made up of reinforced concrete shear walls that surround the central elevator and exit stair core. These walls are 24 to 48 inches thick. Here is a plan taken from
All of the data for this post was also taken from New Geography.
The tower’s foundations have been well documented, or at least frequently mentioned, because of how deep they had to go down. The site has poor soil conditions (fill, sand, San Francisco “old bay clay”, and weak bedrock), and so given the weight of the tower the only option was to go down to bedrock – approximately 250 feet below grade.
The foundation system they ended up going with uses something called Load-Bearing Elements (LBEs). The typical LBE measures 5′ x 10.5′. The entire foundation system uses 42 LBEs and a mat foundation that varies in thickness from 14′ around the core to 5′ around the perimeter. (See image below.) The LBEs were brought down to rock. And in some cases, they went down more than 310 feet below grade.
As a condition of buying the site, the Transbay Joint Powers Authority required proof that any future tall building would not negatively impact the surrounding structures – including the adjacent Transbay Transit Center – and that it would perform under a Maximum Considered Earthquake (MCE) event.
So while the tower itself may be a symbol for the new world, its structural system also achieves many firsts in terms of how to build a supertall in a seismically active region.
Please keep in mind that I am not a structural engineer. I just pretend to be an architect sometimes. If you’re interested in more of the details, check out the post by Ron Klemencic. All of the above information was taken from there.
All of the data for this post was also taken from New Geography.
The tower’s foundations have been well documented, or at least frequently mentioned, because of how deep they had to go down. The site has poor soil conditions (fill, sand, San Francisco “old bay clay”, and weak bedrock), and so given the weight of the tower the only option was to go down to bedrock – approximately 250 feet below grade.
The foundation system they ended up going with uses something called Load-Bearing Elements (LBEs). The typical LBE measures 5′ x 10.5′. The entire foundation system uses 42 LBEs and a mat foundation that varies in thickness from 14′ around the core to 5′ around the perimeter. (See image below.) The LBEs were brought down to rock. And in some cases, they went down more than 310 feet below grade.
As a condition of buying the site, the Transbay Joint Powers Authority required proof that any future tall building would not negatively impact the surrounding structures – including the adjacent Transbay Transit Center – and that it would perform under a Maximum Considered Earthquake (MCE) event.
So while the tower itself may be a symbol for the new world, its structural system also achieves many firsts in terms of how to build a supertall in a seismically active region.
Please keep in mind that I am not a structural engineer. I just pretend to be an architect sometimes. If you’re interested in more of the details, check out the post by Ron Klemencic. All of the above information was taken from there.
