I have written about the history of public housing a few times on At the Helm of the Public Realm. Studying it as an urban designer and as an architect, has given me many different views on how developments like Pruitt Igoe and Cabrini Green got it so wrong. It seems that every built environment professional has learned their lesson: out of scale, brutalistic structures surrounded by vast amounts of shared, open space fails.

But what we discuss much less often, is how to get it right. The blog post, Housing Design Outdoors on Polis last month gives an overview of what the necessary principles are to create a housing development. The article while written by a planner, Peter Sigrist, who concentrates his research in public housing. While planning is important, the fact that his research yielded results that are so design oriented, proves to me that urban design is one of the most dominant contributors to a successful public housing development.

Public housing and the importance of proximity and accessibilty to mixed-uses. (Image: Wired NYC)

In his own words, the author provides this list of necessary principles for designing space around buildings in a public housing apartment complex as follows:

1. Proximity between buildings
2. The sense of Enclosure in outdoor spaces
3. The Scale of buildings
4. The Accessibility of buildings to residents, and of residents of local amenities
5. Additions of items and facilities between buildings (including trees, parking, and places of leisure)
6. Materials that improve aesthetic quality and maintenance
7. The Style and the architectural elements of a space

What has the greatest influence on the design of public spaces are the buildings that form them. Therefore, if we get the building form, scale, and interior spaces wrong, their isn't much hope for what surrounds it. Consequently, while Sigrist says these principles are about the design of public space, he is actually listing architectural principles of building form.

The first 3 principles, proximity, enclosure, and scale, while slightly different, are very much integrated with one another. Proximity between buildings is important, because it provides a human (and comfortable) scale of open spaces. Buildings have to be close enough to one another, so that the entirety of the space between them can be overlooked for safety purposes. Enclosure of outdoor spaces, which should also be at a human scale, is directly affected by the proximity of the buildings that form them. What Sigirst doesn't explain, is that the sense of enclosure that makes humans feel comfortable needs to be formed by "active edges" to a building, whether its retail or residential openings in the facade. This once again allows overlooking of the enclosed space. Blank walls and fences make people feel unsafe and uncomfortable and should be avoided despite enclosure. If these are unavoidable, it should only be in private and physically secure spaces.

Finally, scale is the principle that completely determines the first two. Sigrist is right on when he says, "Higher buildings result in cavernous settings when grouped together, and conspicuous voids when spread apart. Longer and wider buildings can impede walkability and reduce green space. Expansive façades highlight repetition, monotony and decay. Smaller buildings tend to be associated with comfort around housing, perhaps because of the psychological effects of less-polarized differences in scale." The end and short of it is that people's comfort is tied to their human nature, which scale directly reflects. When people are disconnected from the elements that reflect their humanity (such as trees, for example), they have the tendency to lose it.

A comparison between the overlooked, public space designed at the human scale, and the negative effects of the opposite in public housing (Image: Studio Engleback and The Affordable Housing Institute)

Accessibility between residents and community mixed-uses, such as transit, retail and schools, are just as important as the form of open public spaces. Public space can only be healthy if it is actually used. If people do not use it as a pedestrian route from their home to local destinations, it may become less used, less loved, and less looked-after. One of the largest issues in public housing complexes is the maintenance of open space. One of the largest reasons is because people can feel like it doesn't belong to them. If people have an emotional connection to a place, they will want to care of it. Level of activity is crucial to the success of public spaces, which is directly dependent on a development's location to its surrounding neighborhood and strong physical connections with its context. If a development is within a hot climate, trees (as the author states), are crucial in providing a micro-climate in which people can still use a space all year round, which is imperative to maintaining activity. However, while Sigrist says that hedges are acceptable despite their disconnecting effect of residents from the public realm, I completely disagree. Not only do they impede access, they prevent overlooking and harbor unsafe places.

While the last two principles, material and style, certainly contribute to the health of open, public spaces, they are not necessary; if we achieve the first 4 we have fought 99% of the battle. This research shows that the success of public housing, or any housing for that matter, is dependent on their location in relation to mixed-uses, the human scale of the architecture, and defining the relationship between buildings.

The takeaway of this research is that the issue of public space must be considered at the nascent of the planning process…some benches can't fix what is already broken. Also, the slight difference and fine minutia that differ between an urban designer and an urban planner discussing the same issue is evidence that the built environment is a challenging and complicated professional sector. If we learn to work together, and fill in the gaps that are expertise leaves, we can create big change and solve even the most challenging problems….So, an architect, a planner, and an urban designer walk into a bar…