The First Priority of Architecture

Architecture is a building, or collection of buildings, providing shelter that often includes exterior pavement and project open space. It is supported by the Movement, Life Support and Open Space divisions of the built environment and displaces its source of life -- the Natural Domain. 

Architects appear to be searching for a definition that distinguishes architecture from buildings by emphasizing fine art, but fine art is not the first priority for shelter in a world that demands symbiotic correlation from all living functions.

 

Evaluating architecture with opinion is a fine art tradition, but it does not address the problem of shelter composition and context for growing populations within symbiotic limits. This is not only a first priority for architecture and city design, but for us all.

 

The appearance of architecture can only be judged, but the composition, intensity and context created by the relationship of building mass and pavement to project open space can be measured. These project characteristics combine with a city’s land use allocation, movement, open space, and life support systems to determine its physical, social, psychological and economic quality of life. Architectural appearance symbolizes the culture, talent, and knowledge that led to the decisions adopted; but we are not even close to the knowledge required for shelter appearance to indicate symbiotic awareness and achievement.  

 

Architecture has not emphasized symbiotic land use allocation, building composition, and context design regulations in the face of a speculative desire for maximum development capacity at minimum cost; but the issue of shelter for the many activities of growing populations has sustainable public consequences it is qualified to address. 

The symbiotic allocation mentioned in the previous paragraph has several decision-making layers. The first involves the amount of land allocated to the Built Domain and the land that remains for its source of life, the Natural Domain. Within the Built Domain, allocation involves land designated for shelter, movement, open space and life support. Within the Shelter Division, it means the allocation of land for activity, intensity and open space that can protect a growing population’s quality of life and economic stability. Within a single Shelter Division project, it means the allocation of land to accommodate building cover, parking cover and project open space. The addition of building height produces building mass (volume) that combines with pavement and is offset by open space to produce project composition and intensity. The final design of composition produces the context we experience. Within each building, energy is allocated to mechanical systems that serve spatial allocation for building activity, but energy conservation is the closest we have come to considering symbiotic relationships with the source of this energy. In the end, architecture is about the wise use of land and resources for shelter. Form follows function that respects the symbiotic law of Louis Sullivan’s poetry. This is when architecture will bloom in many ways, and some will be judged fine art.  

 

Symbiotic science is beyond my level of competence, so I’ll stick to the architecture I know and the city design that will lead activity allocation, shelter intensity, composition and context design. The visible shape of these decisions has been commonly referred to as “urban form”. 

 

An architectural project falls into a design category represented by a forecast model. The model is like a musical instrument with a fingerboard called a design specification template. Each topic in the template is a string of the instrument. The values assigned to each topic are notes in a score. The score for each instrument combines with the talent of the musician to determine the quality produced. At this point, however; the instruments are new; solo performances suffer from scores written by the audience; and symphonies have not been written by qualified composers and executed by conductors in control of the orchestra. Is it any wonder that we have dissonant sprawl threatening our source of life? The symphonies we call cities have grown into an embarrassment that is emerging as a threat to the survival intended. A great solo performance without a score has been called architectural fine art, but we cannot survive on fine art when accumulated knowledge and awareness are required to sustain success over generations. 

When architecture can define symbiotic land use allocation and resource consumption within a built environment that improves the quality of life for growing populations, it will advance to context design contributions in the public interest. This is a goal that will distinguish future architecture from centuries of previous building effort. 

 

Architecture has a long history of correlating knowledge to produce combined contributions that are more than the sum of their parts. This is another point in history when it can choose to create new disciplines similar to its previous engineering contributions, or follow with the lack of coordination this implies.

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AUTHOR NOTE: If this essay has retained your interest, you may also be interested in software entitled, Development Capacity Evaluation, v.2 that is attached to my book / manual entitled, Land Development Calculations, ed.2. They were published by The McGraw-Hill Companies in late 2009 and are available on Amazon.com.

John Muir, Louis Sullivan & Architecture

Competition seeks dominance. Correlation is enforced by a power that demands coexistence. Compromise is human recognition that domination threatens correlation and survival.

This comment was prompted, oddly enough, by a Ken Burns documentary on PBS about John Muir. Muir was a naturalist and preservationist whose relationship with Theodore Roosevelt paved the way for Yellowstone, Yosemite and the national park concept of natural preservation. He believed human settlement must be separated from natural preservation because its competitive advantage and lack of symbiotic awareness prevented coexistence.

Muir’s opinion was opposed by Gifford Pinchot, the first head of the U.S. Forestry Service. Pinchot believed that natural resources could, and should, be managed for long term sustainable commercial use. He also believed that forestry was tree-farming, and that farming the environment would produce the “greatest good for the greatest number”.

Recovery from a harvest does not reproduce the world that is confiscated, however; and we are only beginning to realize that our dependence on this world is greater than our dependence on the farm. In fact, the Muir-Pinchot disagreement serves to illustrate that we live in two worlds. The Built Environment includes farming and is a bee hive within a Natural Domain that is its source of life.

The argument came to a head when Roosevelt was asked to balance the political interests involved. Muir could not prove that extinction was a possibility and Pinchot could prove that farming produced benefit. The result was a decision that reflected the balance of environmental power and awareness at the time. Roosevelt chose to support efforts to dam the Tuolumne River as a water reservoir for San Francisco. This flooded the Hetch Hetchy Valley. Unfortunately, the Hetch Hetchy was considered equal to the Yosemite Valley in natural significance. The wisdom of this decision will be reconsidered when the world is no longer considered a farm.

Pinchot advocated the “greatest good”, but it was a one-sided definition that ignored CORRELATION and cut through interactive environmental relationships. The result in this example was domination of the San Francisco Bay and extinction of the Hetch Hetchy Valley. This wasn’t farming. It was confiscation with consequences that will only be revealed when knowledge improves awareness and prediction.

We are still unable to define the words “sustainable” and “symbiotic”. This fills debate with sound bytes written to influence rather than persuade; but more are beginning to question “the greatest good for the greatest number”. They are beginning to realize that a “world without end” is not an infinite place for “the greatest number” and survival is at risk when the “greatest good” ignores its source of life.

The answer is somewhere between Muir and Pinchot, but I favor Muir until we reach the level of awareness Pinchot called “sustainable”. We all know we’re not there -- yet.

I believe the shelter capacity we provide within symbiotic limits will define the quality of life we achieve and the population we can sustain. This is organic awareness and it challenges our ability to adapt. I’ve written Development Capacity Evaluation software and the manual Land Development Calculations to help with the evaluation of architectural options. They are based on the belief that the survival of form and function depends on correlation with its source of life, and that the Modernist movement over-simplified Louis Sullivan’s famous quote to suit a limited aesthetic objective. Sullivan said, “…That form ever follows function. This is the law.” In other words, a flower blooms when its functions are correlated with its source of life.

We must correlate our place within the gift we have been given. If we do not adjust to the forces that surround us; our growth and competition for dwindling resources will simply produce extinction. Neither Muir nor Pinchot advocated this outcome, and both were searching for alternatives in a culture of compromise that must respect an uncompromising universe.

Taking the Pulse of Architecture

There is a simple truth in architecture. Building mass and pavement are offset by project open space to produce levels of project intensity. These projects accumulate to become the Shelter Division of the Built Environment. When “over-development” occurs, parking lots and the right-of-way become surrogates for open space. Public reaction to this hostile environment produces escape by “sprawl”. Navigating this Scylla and Charybdis of intensity will require more than a choice between two tragedies -- but the dead reckoning of politics, real estate law, planning regulation, and development construction is not equal to the challenge. These efforts seek to influence architectural decisions without understanding its interactive response to independent requirements. It’s like prescribing medicine without understanding its side effects.  

The pressure within cities is called “intensity”. Like blood pressure, it can be an indication of sickness or health. High and low blood pressure is caused by political assumptions and design specification values that represent city design decisions. Fortunately, it is possible to accurately measure the pressure of intensity by recording design specification values that determine its mass and context. This makes it possible to observe, index and evaluate the conditions created. These conditions represent the architecture of city design. The challenge is to lead it toward symbiotic compositions based on the knowledge acquired. 

Design specification values interact to produce development capacity options. These options can be predicted with forecast models. Development capacity is gross building area GBA. I’ve used it as a surrogate for building mass in these models because floor area can be used to predict many related implications. When talking about Development Capacity Evaluation software DCE, therefore, mass and capacity are synonymous terms.  

Building mass and pavement is offset by project open space to produce levels of intensity, and intensity is a term defined with design specification values that have leadership potential. I’ve attempted to summarize these values with an index of intensity in the forecast models mentioned, but have not been happy with the results. These indices have taken the form (f.S) and (GBA / BLAC). In the first, (S) is the percentage of buildable land area provided as project open space and (f) is the number of floors present, planned or permitted. Unfortunately, (f) is an inadequate description of mass and open space S reports quantity with little indication of context that changes with mass and height. In the second, intensity is predicted as the gross building area in square feet per buildable acre available. It is a definition of mass and intensity that leaves context to the imagination and may be too detailed for leadership application.  

Ideally, an intensity index would indicate the massing, intensity, and context present, planned or predicted. This has led me to search for another option, but first I’d like to explain some terms for first-time readers.  

Definitions 

Figure 1 illustrates terms such as gross land area GLA, net land area NLA, unbuildable land area UNB, buildable land area BLA, and core land area CORE. Unbuildable areas include, but are not limited to, excessive slopes, ponds, wetlands and unstable soil. They represent scenery that does not reduce the intensity of the buildable land area inhabited. They are excluded from intensity calculations because inclusion produces a lower intensity value that distorts the habitable conditions created. In other words, buildable land area is equal to net land area minus unbuildable area as shown in Figure 1. All intensity calculations are based on this logic to convey a better indication of the habitable conditions present, planned or predicted. In mathematical terms, BLA = NLA – UNB and buildable area is available for core area development and project open space BLA = S + CORE. The core area calculated is available for parking cover and building cover CORE = PCA + BCA. The percentage of open space S provided within the BLA offsets core area development and defines two-dimensional site plan balance.  

Figure 1: Site Plan Naming Conventions

Building mass emerges from building cover within a core area. It combines with two-dimensional development cover and is offset by project open space S to create three-dimensional context within a buildable land area. (Think of mass as a glass volume that encompasses all detailed architectural form and appearance with a simple geometric shape. Architectural features are sculpted from the volume defined like a sculptor releasing form from a block of marble.) From a planning perspective, MASS = GBA = (BCA * f). A massing index indicates the relationship of building mass to buildable land area Mx = GBA / BLA. An intensity index indicates the relationship of building mass to project open space Ix = Mx / S, and context has an inverse relationship to building mass Cx = 1 / Mx. In the Cx equation, context begins with a project open space percentage allocation S that is part of the massing equation. The benefit from constant S declines as mass increases with height in the core area. This is more clearly explained in the derivation to follow. 

Derivation 

Given: 

MASS = GBA

GBA = f * BCA 

These are conventions adopted for architectural massing calculations when the sky-plane requirements for high-rise buildings are not a factor. Sky-planes will be addressed later.   

When gross building area GBA in square feet is divided by the buildable land area BLA in square feet, the result is a massing index Mx that is a multiple of the BLA. It is similar to a floor area ratio FAR, but the divisor is based on buildable land area rather than total land area. This more accurately reflects the intensity created within a habitable land area.  

Mx = GBA / BLA 

Since GBA = f*BCA and BLA = CORE + S 

Mx = ( f * BCA) / (CORE + S) 

The values f and S are design specification values entered with others in the design specification template of a forecast model. (See Table 1) Building cover area BCA and core area CORE are calculated from these values, along with other fundamental design implications. A massing index Mx summarizes the gross building area GBA impact on the buildable land area occupied. It is expressed as a multiple of BLA and reflects the implications of all design specification values entered.  

Architectural intensity is the relationship of building mass to project open space. An intensity index Ix can be created by dividing a massing index by the percentage of open space provided S at grade. The intensity value increases as massing increases since increasing mass exerts increased pressure on the constant open space allocation. This pressure is also expressed as a multiple of BLA. 

Ix = Mx / S 

Open space benefit drops when mass increases and open space remains constant. The result is context decline that has an inverse relationship to the mass introduced. The Cx index expresses this phenomenon as a multiple of BLA that declines as Mx and Ix multiples increase.  

Cx = 1 / Mx 

In other words, mass and intensity are functions of the values entered in a design specification template. Their index equations summarize the results with values that are multiples of the buildable land area BLA. Context declines as mass and intensity increase. This inverse relationship is defined by the Cx value that is also reported as a multiple of the buildable land area involved.  

Discussion 

Composition indices can be particularly helpful when attempting to document the decline in open space benefit produced by increasing building mass and height on the same property. For instance, the “Skyscraper” section of this essay shows how a 20% open space allocation can decline to a 1.4% percent benefit when adjacent to a 200 story building, and this doesn’t take present and future population and traffic into account. 

Tables 1 -4 present some examples of massing, intensity and context indices produced by design specification values. Table 1 calculates these indices based on the values entered in the CG1L forecast model. This model represents buildings with grade parking lots around, but not under, the building in non-residential land use areas. Table 2 calculates massing, intensity and context indices for a residential apartment building using the forecast model RG1L. Table 3 calculates these indices for a single family zoning table. Table 4 calculates them for a high-rise building using a modified version of CG1L. 

Massing, intensity and context indices summarize an architectural composition of mass, pavement and space. The summary pertains to the design category represented by the forecast model chosen. The values entered in its design specification template produce development capacity, or intensity, options summarized by these composition indices.  

Tables 1–4 demonstrate how composition indices are forecast. They can also be measured at existing locations for comparison with their broader physical, social, psychological and economic implications; but we have not begun the process. This puts us at a level of awareness equal to those who first experimented with blood pressure. They lacked a diagnostic history, but began to record their readings and correlate the conditions observed. Architecture and city design can benefit from the example.  

Mass and intensity can easily dominate public benefit, which has been referred to as its health, safety and welfare. When project open space at grade is zero private benefit is served by the building, but public benefit declines to a margin of sidewalk served by a modicum of light, air and ventilation in the public right-of-way. The right-of-way benefit is then reduced by growing populations and traffic attracted to the adjacent real estate investment. This is covered in more detail under “Right-of-Way”, but it points to a refined version of the simple truth mentioned earlier. Mass and intensity are offset by open space context. A paucity of context produces oppression while excess produces sprawl.  

Examples 

Table 1 presents a prediction of massing GBA options based on the forecast model CG1L and the values entered in its design specification template. Project open space is entered as 30% of the buildable land area. The design premise for this model is a grade parking lot surrounding, but not under, the building(s). A range of values for f is entered in its Planning Forecast Panel. Values for BLA, GBA, and BCA are calculated and presented in its forecast panel by the model’s embedded equations. Mx, Ix, and Cx results are calculated from these predictions in the last three columns. They can also be calculated for existing projects by taking field measurements for BLA, GBA, BCA, S and f. 

The massing range Mx predicted in Table 1 for one to four story building options is 0.25 / 0.381 of the buildable land area BLA. The intensity range Ix is 0.833 / 1.171 times BLA and the context range Cx is 4 / 2.85 times BLA. The context values describe a decline from 4 / 2.85 as building mass and intensity increase with height. (Tables 1 – 4 are presented at the end of this essay to avoid interruption.) A context decline from 4 to 2.85 is not tragic, however. It indicates that the context benefit from a 30% open space specification is still 2.85 times BLA . The massing range from 0.25 to 0.381 times BLA is still a modest fraction. This indicates that the intensity increase from 0.833 to 1.171 times BLA is well within tolerable limits. 

Table 2 is based on the same design premise and open space provision of 30%, but contains a different design specification template for apartment buildings. It indicates that the massing range for one to four story apartments is 0.43 / 0.84 times BLA. The intensity range is 1.2 / 2.8 times BLA and the context range is 2.35 / 1.19 times BLA. This shows a similar decline in context benefit from 2.35 to 1.19 as mass increases from 0.43 to 0.84 times BLA. Intensity also increases from 1.2 to 2.8 times BLA. All of these readings, however, indicate benign massing, intensity and context relationships. 

In Table 3, buildable land area BLA is equal to the minimum lot size permitted per dwelling unit in each zone. It shows that a rather typical single family zoning ordinance permits a massing range of 0.15 / 0.625 BLA; an intensity range from 0.167 / 1.250 BLA and a context range from 6.667 / 1.60 BLA. The massing index range (0.15 to 0.625 BLA) indicates that gross building area is a fraction of the minimum lot area required in each zone. The low end of the intensity range (0.167 BLA) indicates that intensity is also a tiny fraction of BLA while the high end (1.25 BLA) indicates what is presently considered a rather small detached single-family residential lot. The high end of the context range (6.667 BLA) indicates that open space benefit is 6.66 times BLA for a 3 acre lot. The low end (1.60 BLA) indicates that project open space benefit remains greater than BLA for a 9,000 sq. ft. lot. This highlights the desirability of low density residential massing while also explaining the contribution of high context values to excessive sprawl. 

Table 4 includes the unique characteristics of skyscraper sky-plane requirements. It is based on 20% open space and all other design specification values entered. A more detailed explanation will follow; but for now, Table 4 predicts that a 50 story skyscraper will produce a building mass equal to 31.6 times the buildable land area BLA, intensity equal to 158 times BLA, and context equal to 0.0316 times BLA. It also shows that a 100 story skyscraper will produce mass of 50.7 BLA, intensity of 254 BLA, and context of 0.0197 BLA. Common sense is again confirmed. The context range of (.0316 / .0197 BLA) declines as the massing range of (31.6 / 50.7 BLA) and the intensity range (158 / 254 BLA) increase.  

As I mentioned, these readings are like blood pressure without medical research. They provide an accurate picture, but the physical, social, psychological and economic implications of these readings remain to be determined.  

In summary, Tables 1-4 indicate that when design specification values remain constant; increasing building height increases mass and intensity while context benefit declines. These relationships are charted in Figure 2 based on Table 1 statistics. 

Figure 2: Relation of Massing and Intensity to Context

City Design 

Project context is inversely proportional to mass and intensity on a given buildable land area. This does not take street width, traffic type, traffic volume and surrounding intensity into account. These factors are controlled by the decisions of others, but they are part of the public issue I’ve referred to as city design. City design intensity is equal to the sum of its parts. Shelter intensity is one part that is equal to the sum of individual architectural projects. These have independent and collective social, psychological and economic implications. This may help to explain how architecture contributes to city design; why I’ve used the term “architecture of city design” in some essays; and how independent architectural decisions must be woven together with project open space contributions to avoid dissonance. 

Rights-of-Way 

Right-of-way width is the foundation for public context within the public domain. Many of these rights-of-way are consumed by traffic volume and supplied with minimum standards of light, air, and ventilation. In some cases these rights-of-way are more than one-hundred years old and growing populations have become compressed along narrow ribbons of sidewalk reduced by increasing traffic volume and degraded by its pollution. This brings the entire concept of dual-purpose rights-of-way into question -- if it ever existed as a balanced concept in the first place.  

The public interest is again involved. The building mass, context and intensity created along these rights-of-way can trap populations in corridors too congested to serve their original purpose, let alone a combined purpose. We are all familiar with this road named Decline and it is a city design topic for another day. In simple terms however, we cannot afford the continued belief that hospitable cities are woven together with movement systems.This is a utilitarian point of view that ignores the environmental consequences of sprawl and the human consequences of foreign objects within the urban anatomy.

Our quality of life is woven together with public and private open space. The combination of shelter and open space is served by its movement and life support systems. Service has had priority over shelter in the name of progress, but increasing awareness will lead us to equalize these priorities as we continue to search for a symbiotic future.  

Skyscrapers 

A measurement system must be able to accurately measure the entire spectrum of possibilities. This applies to all systems from decibels and voltage to metric commodities. In architecture and city design, the measurement range extends from low density residential subdivisions to high density skyscrapers, but density has been an inaccurate measurement tool producing random leadership results.  

To test intensity measurement at the skyscraper end of the spectrum, I modified forecast model CG1L and expanded the design specification template to reflect the unique “sky-plane” responsibilities of this building type. This unique requirement deserves a brief history.  

The skyscraper emerged as a capacity multiplier during the troubled times of the tenement. Social reform searched for the soul of free enterprise and substituted regulation. It actually became necessary to specify that light, air and ventilation could not be obstructed by the private construction of tall buildings. Freedom, in this case the freedom to dominate, was an inevitable defense; but the public interest could not be ignored. Increased setbacks were required for increased height to permit light and air to reach the right-of-way. The modern ziggurat, or wedding cake building, emerged in response along the street canyons of mega-cities. The setback regulation was called a “sky-plane”. Building form has become more sophisticated along with regulation, but the policy remains the same. It specifies that the public has a right to light, air and ventilation, but inducement must be offered to augment a right-of-way under pressure from the land use activity spawned at street level.  

I have adopted a simple pyramid concept for this example similar to the Transamerica Pyramid in San Francisco and have modified Table 1 to reflect the number of sides and the slope involved. Two rows have been added to the bottom of its design specification template for this purpose. The first asks for the percentage reduction in area per side for each additional floor in height. This is the slope of the pyramid face. The second asks for the number of building faces involved. In this case I have used four sloping sides with a total reduction in floor area of one percent per floor. Calculation is based on the assumption that each slope begins at ground level. Each floor of massing potential intersects the sloping plane and potential area per floor is calculated on this basis.  

This is a definition of development capacity expectations, not building form. Remember that massing is an imaginary glass enclosure. Its purpose is to establish massing and context parameters for detailed architectural definition. The forecasts in Table 4 define these parameters. 

Figure 3: Transamerica Pyramid

Table 5 summarizes the predictions in Table 4 and illustrates the classic relationship between massing and intensity on one hand and context on the other. A ten story building with a 20% open space allocation declines in context benefit to 13.7% BLA. A 200 story building declines to a 1.4% BLA benefit while massing and intensity steadily increase. It is up to us to determine the course between this modern day Scylla and Charybdis.

Table 5: Massing, Intensity and Context as Multiples of BLA from Table 4

Summary 

Table 6 summarizes the massing, intensity and context pressures forecast for each example used in Tables 1-4. They have been produced by values assigned to the design specification topics that pertain to each forecast model mentioned. The alternatives to these predictions are infinite because of the scope of topics, the scope of values that can be assigned to each topic, and the anatomy of the topics involved.  

Table 6 indicates that empirical observation can be confirmed with an accurate measurement system. Architects understand that the benefit from a given open space allocation declines as additional building mass increases the pressure, or intensity, imposed. I’ve called the level of benefit “context” and suggested a method of measurement to quantify observation and build knowledge. The goal is to replace subjective terms like “over-development”, “pleasing’, and “pastoral” that cannot lead growing populations toward symbiotic natural relationships.  

Table 6: Massing, Intensity and Context Summary for Tables 1 – 4

In architecture, pressure is called “intensity”. Table 6 indicates that pressure can be measured with three readings that I’ve called composition indices. Like blood pressure, these readings indicate the current state of health for a far more complex anatomy, but blood pressure has a frame of reference. Architecture and city design have yet to adapt a method of composition measurement that can place subjective observation into an objective research system. 

If you look at any horizontal row in Table 6 you will see that context declines as massing and intensity increase with building height when all other design specifications remain constant. If you look at a column, however, you will see the influence of separate design specification templates. The increase in massing, intensity and context is not a consistent increase from single-family homes to high-rise buildings because these templates contain different topics related to their specific land use family and design premise. In other words, the columns show a trend toward declining context as mass and intensity increase with land use family and design category, but there are too many design specification topics and values in each category to make this more that a trend among categories. In other words, a corporate office in a park could have a better context reading than a single family detached home on a 6,000 square foot lot with 50 feet of frontage because of the different design specification values involved. Building additions would then increase these mass and intensity readings as the context reading for each declines.  

In summary, medicine has learned to correlate blood pressure with the health of an anatomy that is a gift. We are now attempting to interpret the health of an environment that is a gift, and we have imposed cities to shelter growing populations on and in this gift. Science would recognize these cities as a parasite facing extinction because there is no “land without end” just as there is no flat earth. The gifts we have been given demand correlation and the next level of awareness will come to grips with the scope of our responsibility. The more common term for correlation is “adaptation”. If a species does not adapt it faces extinction from internal competition and external exposure. It is an inevitable outcome of failure, and we have been given a gift that enables us to adapt with the design decisions required for correlation. Science has named mutual benefit “symbiosis” and it is a worthy goal for our next level of awareness.  

I have tried to resist ending with a musical analogy; but the composition indices of massing, intensity, and context are too tempting. If a city is an orchestra, its instruments are forecast models in the DCE collection. Each instrument has three strings; one for each of the three composition indices mentioned. Finger placement on these strings is defined by the values entered in the instrument’s design specification template. Sound is a function of the template, the instrument and the musician. A symphony is a correlation of templates, instruments, and musicians. Acoustics is an environmental response. If you find a composer to be a mystery and his composition a riddle within an acoustic enigma, the challenge to create urban symphonies within symbiotic cities surrounded by environmental judgment should become apparent. Less is known, more is expected and relief by escape from the auditorium is an illusion.

Postscript

Some may have noticed that the Derivation section of this essay explained that:

Mx = GBA / BLA, or

Mx = ( f * BCA) / (CORE + S), and

Ix = Mx / S

The value S in the extended Mx equation helps to express a simple numeric relationship between development capacity GBA and buildable land area BLA.  The result Mx expresses capacity as a multiple of the buildable land area but does not explain the declining benefit from a given project open space allocation as building height, mass and capacity increase. 

When increasing mass Mx reduces the benefit from a given project open space allocation, the result is an increasing level of intensity Ix. The opposite is also true. Increasing project open space S decreases the intensity from a given building mass Mx. This theorem has been expressed with the equation Ix = Mx / S.

The value S in the Ix equation is a percentage of the BLA that cannot exceed 99.99%. As the percentage increases and Mx remains constant, intensity Ix declines. A value of S = 100% is a park without building mass and the entry should produce an error message. A value of S = 0.0% is a building without project open space, but the value defaults to 0.0001% because zero would produce the lowest rather than the highest intensity reading when no project open space is provided.

Table 1: Massing, Intensity and Context Summary for CG1L Design Premise

 Table 2: Massing, Intensity and Context Summary for RG1L Design Premise

Table 3: Massing, Intensity and Context Summary for Single-Family Detached Residential Design Premise

Table 4: Massing, Intensity and Context Summary for Hi-Rise Design Premise

Response to Reply -- "The Problem with City Planning"

This is a reply to Eric Davis, AIA. His comments are included in italics below this response.

Eric,

Thank you for the comments. It helps to hear experiences from others. The engineering examples you cite are part of the Movement Division of the Built Environment. It has had an overwhelming federal priority, as you know; and has maintained its focus on civil engineering design specifications. These heavily influence the Life Support Division as well, but there has been little correlation of these standards with the Shelter and Open Space Divisions. We cannot blame them, however, because design specification topics and values for shelter and open space are in their infancy. Zoning topics substitute and zoning values produce unreliable results that still encounter political opposition from entrenched special interest.

My work has been based on the opinion that shelter policy is needed to support a symbiotic goal. This will require convincing political arguments based on credible research. I have concentrated on the Shelter Division of the Built Environment but can understand your disappointment with the random results in the Movement Division as well. The stakes are high and the political opposition is monumental, as you point out. We will not win the battle of opinion without improved arguments, however; and this is where observation, measurement, evaluation, prediction and conclusion come into play.

You used the word “calculation” which is unfortunate. Calculation is an engine for evaluation, prediction and conclusion but is not a substitute for observation and measurement. This is where knowledge begins. Successful arguments are based on the answers found. My work has focused on a measurement system for shelter that can lead private effort toward public benefit with a symbiotic goal. It has actually been stimulated by the failure to win arguments and influence political opinion.

Leaders change course based on persuasion from others. I believe the secret to persuasion is knowledge that has a history of credible performance, but I am the first to admit that another form of calculation has always entered the political equation. This, I believe, is your frame of reference and it will do no good to wish me luck. We will all need luck to pass this symbiotic test from a host that does not compromise with ignorance.   

Civil engineering has produced significant public benefit but the focus has been on limited technical areas. It will continue on this course until corrected with persuasive arguments for city design leadership. This is the next level needed to correlate engineering contribution with the larger symbiotic goal we must all respect. Architects, and many others, understand the broad focus of correlation because complexity has made it their profession. In fact, natural correlation over millennia permits competition within a lifetime. Extinction ia a lack of correlation. This is the next level of cultural awareness. The next great period of architecture and civil engineering will follow to symbolize this cultural and political achievement. 

You may be interested in my upcoming essay, “Taking the Pulse of Architecture and City Design”.

Walter, 

While I agree with pretty much everything you say, there is a significant component missing from your analysis and therefore from your prescriptions. The development of cities - and metro areas - is also simultaneously driven by politics. I'm not talking about Democrat v. Republican, I'm talking about whose ox is being gored, as they say. 

Take an example from my area, Chicago. I live in Oak Park, a close-in western suburb. It was founded as a rail-based commuter suburb. There used to be seven (not a typo) elevated or at-grade rail connections to the town. Now the main artery in terms of volume is the Eisenhower Expressway, I-290. As with most of its ilk, it is a catastrophe in urbanistic terms. For most of its run from the Loop to the I-294 (what is now inner) belt expressway, it is well above grade on an earthen viaduct. 

Except where it runs through Oak Park. For a mile and a half, the Eisenhower becomes a depressed highway, a good 30' below the adjacent local streets. While part of this has to do with topography - one of the ridge lines that is a Continental Divide, believe it or not, runs through Oak Park. Nonetheless, more than one person in the Legislature at the time has told me that it runs depressed there because of Phil Rock. Who was he? The longtime President of the Illinois State Senate who was from...wait for it...Oak Park.

Even so - it's still freakin' hideous 

Now contrast that with the parkway system out on Long Island. While there are/were significant cultural differences, I would argue that a great deal of why those are so beautiful, with substantial plantings and well-designed stone bridge overpasses instead of ugly concrete and steel ones, is due to a difference in political will. Robert Moses, for better or worse, was a force of nature. He was not about to inflict his vision on the landscape without it also being beautiful and, therefore, something to be seen as a positive impact on the land. 

The only reason that, by contrast, the Eisenhower is so hideous, so disruptive of the urban landscape, is that no one from any of the design professions - at least no one with functioning eyeballs - was in a position to make the critical budget decisions. 

"Oh, but we can't afford it" is what you often hear. After 25 years of involvement in politics at all levels, I can tell you that "afford" is always a relative term. Can we afford $230 million for a single F-35 fighter? Evidently. It's not about priorities, it's about making things like good design a priority. 

There's a story that once FDR was finishing a meeting with a coalition of progressive groups whose mission he clearly supported. Nonetheless, his parting words to the group were (to paraphrase), "Great. Now go out there and make me do it." Even the President who created the WPA needed an expression of political will to make it happen. 

We need to not only read politics, we need to know when and how to drive it. I tell my students, "Politics is a design problem" and the one I like the best, "If you're not at the table, you're on the menu." 

Absent that, the calculations you prescribe are really good ideas with little chance of success because they will get run over every time if the politics of each specific situation hasn't been designed as carefully as the renderings the media loves to print. 

Best of luck.

Eric Davis, AIA

RECALLING LINNAEUS

Linnaeus began to classify the plant and animal kingdoms of the natural environment but overlooked a second world. The built environment was a negligible consideration at the time, but has grown into a competing artificial presence that consumes the kingdoms of his work. This is a contest we cannot win in a universe that does not compromise. It is why every acre of land is precious; why we must learn to live within limits; and why we must use each acre wisely within our world as we attempt to shelter growing populations without consuming the planet. 

The consumption of land begins with the concept of property. I won’t even attempt to address this issue except to say that it has been the foundation of perpetual conflict, and that our current legal concepts encourage consumption that will either appear anachronistic or disappear at some future point in time.  

Adaptation requires a correlation of forces that is not inevitable. Correlation extends over millennia and makes competition possible within any given life span. Without correlation, competition produces extinction and the fittest do not survive. My objective is to provide the tools needed to correlate shelter options for growing populations within sustainable limits defined by the science of others.  

After Apollo 11 most will agree that the Earth is a finite resource protected by a thin film of atmosphere at risk; and that it exists within a universe that is one definition of infinity. Therefore, the development capacity of land to provide shelter for growing populations becomes an issue of survival, since the planet is also a source of life that cannot be consumed with impunity. In other words, the built environment competes for land with the natural environment -- and survival depends on the correlation of forces we barely comprehend.  

Land is used by four divisions within the built environment. The Shelter Division is served by the Movement, Open Space and Life Support Divisions. The relationship between building mass, pavement and open space within the Shelter Division is called intensity, which can be magnified by the surrounding intensity of its supporting divisions. Shelter intensity can be defined as the gross building area constructed per acre of buildable land available. Shelter capacity is found when gross building area is multiplied by the population anticipated per 1,000 square feet of building area forecast. The activities sheltered by building intensity combine to establish the social and economic characteristics of urban form. 

Intensity options can be predicted with Development Capacity Evaluation software (DCE) based on the forecast model chosen and the values entered in its design specification template, and hundreds can be forecast in the time it takes to sketch one. The evaluation of these predictions can help us learn to use each acre wisely, since I’ve pointed out that economic potential is a function of building intensity and activity; but over-development represents a threat to our health, safety and welfare.  

There has been no adequate definition of “over-development”, so the debate has wandered in a forest of detail and emotional confrontation that has only led to annexation, sprawl and blight. Debate has been limited by the language available, and DCE has been written to expand this vocabulary with accurate predictions of building capacity options. This may improve our ability to shelter growing populations within sustainable limits. 

Intensity and context combine to create neighborhoods, districts, cities and regions. When the equations of intensity embedded in DCE software are linked to the economic databases and mapping power of geographical information systems (GIS), the three-dimensional potential of urban form will emerge as options expressed in a visual and descriptive language. This can lead us toward life within limits that protect the health, safety and welfare of two worlds that must now learn to function as one.  

Intensity options represent context parameters. If we must learn to live within limits, then both intensity parameters and context design are critical to our health, safety and welfare.  

Within all divisions of the built environment, physical context is produced by the form, function, appearance, arrangement and intensity of building mass, pavement and open space. Social context is a function of the activities permitted within shelter. Economic context is a function of land use allocation, activity and intensity within a jurisdiction.  

Land use plans, building codes and subdivision regulations have been our most prominent attempts to establish context parameters, but our lack of ability to forecast intensity has produced a sprawling attempt to return to the farm. It will become an increasing threat to the planet until we can define the activity, intensity and land use allocations needed to shelter growing populations within symbiotic limits. This is a worthy purpose for our continued presence if we can accept our stewardship responsibilities for the Linnaean kingdoms and Darwinian correlations we have observed along our own evolutionary path. 

_______________________

          
Author Note: Portions of this article were excerpted and edited from the second edition of my book, Land Development Calculations, and its attached forecasting software, Development Capacity Evaluation, v2.0 published by The McGraw-Hill Companies, 2009.

Introduction to Intensity

Architectural recommendations are difficult to defend when there is disagreement, but decisions affect our sustainable future as certainly as sprawl is consuming our source of life. I originally approached this problem with a desire to understand multi-family residential density. I intuitively felt it was an inaccurate measurement, encouraged over-development, and ignored the issue of sprawl. (See “Replacing Density”; “The Limits of Shelter Capacity”; “Improving the Argument for Architecture and City Design”; and “Context, Capacity and Intensity”) I eventually realized that project open space was a significant element in development capacity calculations and intensity evaluation, but an ignored factor in density regulation. It was the lime missing from the sailor’s diet. This meant that open space would remain a remnant of project design for all land use categories until its development capacity implications could be forecast to permit evaluation, consider alternatives, and justify requirement.

My interest in this topic stemmed from my belief that we simply did not understand “intensity”; could not measure its spectrum from under-development to over-development; could not forecast the spectrum; and as a result could not discuss the issue in terms that could lead development to improved results within limits that protected its source of life. My efforts have produced a method of development capacity evaluation and a vocabulary of intensity that I will attempt to briefly explain, since it has the potential to structure research, define conclusions and defend decisions that are presently vulnerable to attack by opinion. 

Shelter falls into three generic building families and each family uses one of three generic parking systems. Tables 1.1, 1.2 and 1.3 identify these families and parking systems. They also identify the design categories that lead to specific intensity forecast models based on the information given. I’ve called these intensity models development capacity forecast and evaluation models because they predict rows of intensity options related to building height alternatives in their planning forecast panels. 

In effect, Tables 1.1, 1.2 and 1.3 represent decision trees that lead to forecast model identification. Values are entered in the design specification template of a model to produce intensity option predictions in its forecast panel. Changing a value changes a forecast. Switching models changes the design premise.  (These tables are presented at the end of this essay to avoid the interruption they would produce here.) 

Residential and non-residential forecast models CG1L and RG1L are attached as examples labeled Tables 2 and 3. They represent two of forty listed in Tables 1.1, 1.2 and 1.3. The full collection predicts results for all generic parking solutions, including no parking. The approach allows all affected parties to focus on a design vocabulary that defines initial intensity options and shapes all future project direction. 

When evaluating intensity options, a user can alter values in the design specification template of a forecast model to compare results in the design category represented.  He or she can change models to compare design premise or, parking category, options. The result is a strategy based on design premise and specification values that have leadership potential and flexibility. 

It should be apparent after a glance at the design specification templates in Tables 2 and 3 that research is required to identify the implications of design specification values, since many will produce unsatisfactory results in the model’s forecast panel. The research, however, will support recommendations and add credibility to the decisions taken.  

Summary 

Land use and shelter intensity allocation will determine our ability to live and thrive within geographic limits that protect our natural source of life.

Project open space reduces intensity but cannot be ignored, and is included as a conscious entry in all design specification templates.

The planning forecast panels in Tables 2 and 3 predict rows of gross building area options related to building height alternatives when project open space is specified. These capacity options are related to an intensity index INT in the right hand column that takes the form (f.S). The prefix (f) indicates the number of building floors involved. The suffix (S) indicates the percentage of project open space provided within the buildable area. Optional indexes with more detail are discussed in my book. The result is a forecast of intensity options based on an entire set of interactive design specification values.

We need shelter for survival, but total building area must be provided for growing populations within sustainable limits that do not contain excessive intensity. The composition of gross building area, pavement and project open space is shelter. When shelter combines with the movement, open space and life support divisions of our built environment, the composition determines our physical, social, psychological and economic health, safety and welfare.

Exceptional talent will always produce signature buildings that bookmark our progress toward a sustainable future, but design matters because architecture and city design are essential parts of a symbiotic correlation we have called evolution.

Competition produces extinction when correlation is absent. Competition may permit an individual or group to extend its lifespan, but correlation permits the species to survive over time periods beyond comprehension. It not about competition to consume. It's about a correlation of forces that permits continued competition without extinction. This is symbiotic awareness and the correlation of shelter with survival has entered a new dimension of competition where domination is failure.

I have purposely tried to keep this a brief introduction to intensity. For those interested in reading more, there is an extensive collection of free essays on my web site. The 40 forecast models mentioned can be found on a CD attached to my book: Hosack, Walter Martin, Land Development Calculations v.2, The McGraw-Hill Book Companies, 2009.

 

 

Table 2 Development Capacity Forecast Model CG1L

  

Table 3 Development Capacity Forecast Model RG1L