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We are in West Virginia now, where the only kind of housing that we have come across is -- not surprisingly -- low-density, detached, and single-family. Indeed, approximately 75% of the residential land across the entire US is estimated to be zoned for detached single-family homes. Using data from UrbanFootprint, the NY Times recently published a series of city maps outlining the percentage of land dedicated exclusively to this housing type.
In some cases, such as on residential corner lots in Portland, duplexes are allowed. But generally speaking, the pink corresponds to detached single-family housing. About 15% of residential land in New York City is zoned for this, compared to about 94% of the land in San Jose. Interestingly enough, none of the residential land in Manhattan is zoned to accommodate detached single-family housing.
The latest project out of MIT's Senseable City Lab examines the "sensing power of taxis" in various cities around the world. Looking at traffic data, they determined how many circulating taxis you would need to equip with sensors if you wanted to capture comprehensive street data across a particular city. This might be useful if you wanted to measure things like air quality, weather, traffic patterns, road quality, and so on.
What they found is that the sensing power of taxis starts out unexpectedly high. It would only take 10 taxis to cover 1/3 of Manhattan's streets in a single day. However, because taxis tend to have convergent routes, they also discovered rapid diminishing returns. It would take 30 taxis (or 0.3% of all taxi trips) to cover half of Manhattan in a day, and over 1,000 taxis to cover 85% of it. A similar phenomenon was observed in the other cities that they studied: Singapore, Chicago, San Francisco, Vienna, and Shanghai.
However, if you look at the percentage of trips needed to scan half of the streets in a city, Manhattan has the lowest rate at 0.3%. Vienna is the highest at 9%. But I'm not sure if this is a function of the utilization rate of their taxis or if it has something to do with urban form. Singapore has a similarly low rate (0.44%), but its street grid looks nothing like that of New York's.
Here's a short video explaining the project:
https://youtu.be/Vs3q3jQaM9Q
121 East 22nd -- which is OMA's first ground-up project in Manhattan -- recently finished up construction at the corner of E 23rd St and Lexington Ave (the site continues through to E 22nd St, where there is basically a 2nd building). I wrote about the project over two years ago, here.
Below is a photo by Laurian Ghinitoiu, via Dezeen, of it completed:
We are in West Virginia now, where the only kind of housing that we have come across is -- not surprisingly -- low-density, detached, and single-family. Indeed, approximately 75% of the residential land across the entire US is estimated to be zoned for detached single-family homes. Using data from UrbanFootprint, the NY Times recently published a series of city maps outlining the percentage of land dedicated exclusively to this housing type.
In some cases, such as on residential corner lots in Portland, duplexes are allowed. But generally speaking, the pink corresponds to detached single-family housing. About 15% of residential land in New York City is zoned for this, compared to about 94% of the land in San Jose. Interestingly enough, none of the residential land in Manhattan is zoned to accommodate detached single-family housing.
The latest project out of MIT's Senseable City Lab examines the "sensing power of taxis" in various cities around the world. Looking at traffic data, they determined how many circulating taxis you would need to equip with sensors if you wanted to capture comprehensive street data across a particular city. This might be useful if you wanted to measure things like air quality, weather, traffic patterns, road quality, and so on.
What they found is that the sensing power of taxis starts out unexpectedly high. It would only take 10 taxis to cover 1/3 of Manhattan's streets in a single day. However, because taxis tend to have convergent routes, they also discovered rapid diminishing returns. It would take 30 taxis (or 0.3% of all taxi trips) to cover half of Manhattan in a day, and over 1,000 taxis to cover 85% of it. A similar phenomenon was observed in the other cities that they studied: Singapore, Chicago, San Francisco, Vienna, and Shanghai.
However, if you look at the percentage of trips needed to scan half of the streets in a city, Manhattan has the lowest rate at 0.3%. Vienna is the highest at 9%. But I'm not sure if this is a function of the utilization rate of their taxis or if it has something to do with urban form. Singapore has a similarly low rate (0.44%), but its street grid looks nothing like that of New York's.
Here's a short video explaining the project:
https://youtu.be/Vs3q3jQaM9Q
121 East 22nd -- which is OMA's first ground-up project in Manhattan -- recently finished up construction at the corner of E 23rd St and Lexington Ave (the site continues through to E 22nd St, where there is basically a 2nd building). I wrote about the project over two years ago, here.
Below is a photo by Laurian Ghinitoiu, via Dezeen, of it completed:
The defining feature is its "prismatic corner", which, I understand from this interview with David Von Spreckelsen (President of Toll Brothers City Living), was largely an outcome of the site's restrictive zoning. There was a requirement to have constant street walls. That minimized what could be done architecturally on the project's main elevations.
The solution is two contextual street walls -- the punched windows are designed to match the rhythm of their adjoining buildings -- coming together and creating dramatic visual interest only at the point where they intersect. Below is a rolled out elevation from OMA. Note the gradient created by the windows as they converge toward the corner (center in the drawing below).
The other interesting thing about this project is that it reminded me just how different the built form of Manhattan can be compared to Toronto. In the case of 121 East 22nd, the streetwalls rise 150 feet without any stepbacks. There is then a 10 foot stepback before the building rises another 60 feet -- similarly without any additional breaks.
I love the grandeur.
The defining feature is its "prismatic corner", which, I understand from this interview with David Von Spreckelsen (President of Toll Brothers City Living), was largely an outcome of the site's restrictive zoning. There was a requirement to have constant street walls. That minimized what could be done architecturally on the project's main elevations.
The solution is two contextual street walls -- the punched windows are designed to match the rhythm of their adjoining buildings -- coming together and creating dramatic visual interest only at the point where they intersect. Below is a rolled out elevation from OMA. Note the gradient created by the windows as they converge toward the corner (center in the drawing below).
The other interesting thing about this project is that it reminded me just how different the built form of Manhattan can be compared to Toronto. In the case of 121 East 22nd, the streetwalls rise 150 feet without any stepbacks. There is then a 10 foot stepback before the building rises another 60 feet -- similarly without any additional breaks.
I love the grandeur.
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