# Chapter 2: What is a Master Street Plan? If streets are the permanent framework of cities, lasting thousands of years, then surely we should have a careful method for designing them. We do. Or rather, we did. It's called a _master street plan_ (also known as an _official map_), and it's the most forgotten tool in city planning that may also be the most important. A master street plan is exactly what it sounds like: a plan that shows all the streets. The radical part: it shows _all future streets_ within an entire jurisdiction. Every single street that will ever be built is planned at once, mapped out before the first building goes up, before the first resident moves in, sometimes before anyone even knows what the land will be used for. Every street that's drawn creates new frontage, the edge where buildings meet the public realm. This might sound impossibly ambitious. How can you plan streets for development that won't happen for decades, for buildings you can't yet imagine? The answer is that you don't need to know. It's better if you don't. The commissioners who laid out Manhattan's street grid in 1811 couldn't possibly have imagined skyscrapers. The technology didn't exist. They were planning for a city of rowhouses and churches, maybe some light industry. When they wrote that the northern end of the island was unlikely to be covered with houses "for centuries to come," they were thinking of gradual, incremental growth.[^1] Instead, Manhattan exploded. Those rowhouses became tenements, then apartment buildings, then office towers. Uses the commissioners never dreamed of (subway stations, parking garages, data centers) all found their place within the grid they drew. The paradox of master street plans is that they work best when they don't try to predict the future. Contemporary planning tries to predict where growth will occur, what types of buildings will be needed, which areas will be commercial or residential, and the future always surprises it. A master street plan prepares for the future without trying to predict it. Instead of designing for a specific future, it creates a framework flexible enough to absorb whatever comes: new technologies, changing demographics, economic shifts, uses we can't yet imagine. Consider a sheet of graph paper. The grid doesn't tell you what to draw. You could sketch a face, plot a mathematical function, design a building floor plan, or play battleship. The grid simply provides a neutral, flexible framework that makes any of these activities easier. A master street plan works the same way, but at the scale of a city. A master street plan is simple: just parallel lines indicating public rights-of-way. On paper, a quiet residential street can look identical to a major urban thoroughfare if they're the same width. Two 60-foot rights-of-way appear as two sets of parallel lines, 60 feet apart. That's it. But this simplicity is the point. One of those rights-of-way might start as a rutted dirt road serving a handful of farms. The other might be paved from day one, lined with shops and apartments. Given enough time, growth, and change, the dirt road can evolve into an urban thoroughfare indistinguishable from its sibling. The boundary lines are the same; only the level of development differs. Imagine buying a thousand-piece puzzle. You open the box, dump out the pieces, and... there's no picture. No reference image showing what you're trying to build. You have all these intricately shaped pieces but no idea how they fit together. You might eventually complete it through trial and error, but it would take forever and you'd make countless mistakes along the way. This is how most cities develop today: piecemeal, parcel by parcel, with no overall vision of the final form. Each developer does their best with their individual piece, but without a big picture to reference, the pieces often don't fit together well. You get office parks and buffers, street networks that don't connect, and a jumble of incompatible patterns. A master street plan is like the picture on the puzzle box. It shows the final urban form—not the buildings, not the uses, just the essential framework of streets and blocks. Now every developer, whether they're building today or in fifty years, knows exactly where their piece fits. A developer in 1850 and another in 2050 are working toward the same coherent whole. The second analogy is even more direct. In architecture, construction drawings show where every wall should be built. Contractors follow these plans, and the result is a building that matches the original design. You wouldn't dream of building a house without blueprints, letting each subcontractor decide where to put walls or HVAC based on their own judgment. Yet this is exactly how we build cities today. We let each development create its own street pattern, hoping they'll somehow connect sensibly with future neighbors. They rarely do. A master street plan is a blueprint for a city. It shows where each street should be built. As development occurs, developers construct new streets where indicated. After decades or centuries, the city reflects the original intention. The key difference from architectural blueprints is timing. A house is built all at once by a single team. A city is built incrementally by thousands of different builders over centuries. The master street plan coordinates all these otherwise uncoordinated efforts toward a common framework. ## Frontage Every new street creates something irreplaceable: _frontage_. Frontage is the face of the city. It's the ground-floor edge where private property meets public space, where buildings present themselves to the world. This edge (measured in linear feet) is where urban life happens. It's where shopkeepers arrange window displays, where people access their homes or places of work. Without frontage, you don't have a city. The places people love to visit (Paris, Barcelona, New Orleans, a favorite small town) are all experienced from their streets. The more streets you have, the more "place" you have. Compare that to a typical suburban office park or shopping mall. The building might contain the same square footage as a traditional urban block, but it presents only one or two faces to the public realm. The rest is internalized parking, blank walls, service areas. Hundreds of feet of potential frontage wasted, turned inward, an inefficient use of land. This is why the number of streets matters as much as their design. Every street creates two faces. A traditional grid with blocks of 300 by 400 feet creates vastly more frontage than superblocks of 1,000 by 2,000 feet containing the same area. It's simple mathematics: more streets means more frontage which means more town. Consider two hypothetical 100-acre developments, both served by 60-foot streets. The first follows a traditional pattern with blocks of 300 by 400 feet. The second uses a suburban pattern with superblocks of 1,000 by 2,000 feet, each turned inward around a parking lot. | | Traditional grid | Superblocks | | :--------------------------------------------------------------------------------------- | :----------------------- | :----------------------- | | Block size | 300 by 400 feet | 1,000 by 2,000 feet | | Blocks in 100 acres | about 26 | about 2 | | Street frontage | about 36,800 linear feet | about 12,000 linear feet | Same acreage. One-third the frontage. This isn't just about retail. Residential frontage matters too. Front doors, front porches, front yards—these create what Jane Jacobs called "eyes on the street," the natural surveillance that makes neighborhoods feel safe and alive.[^2] A house facing a street contributes to civic life in a way that a house facing a parking court never can. The master street plan, then, is largely a frontage plan. It's a way of ensuring that as a city grows, it maximizes the opportunities for private life to engage with public space. Every street drawn is an opportunity. Every block created is a frame for future buildings. It converts "raw land" into "our town". Street networks matter more than land use plans because uses change, but frontage is forever. A new right-of-way creates new frontage on each side whether it's lined with houses, shops, or offices. The specific use matters less than ensuring the frontage exists in the first place. When cities abandon master street plans, they abandon frontage planning. Each development becomes a haphazard island, connecting to the existing network at a few points. The result is a city of backs—back of house, back of shop, back of office—with almost no front. The master street plan solves this by thinking through frontage from the beginning, ensuring that as the city grows, it grows with its face forward rather than its back turned. ## How a Master Street Plan Works The most famous and well-documented example of a master street plan in the US is the 1811 Commissioners' Plan of Manhattan. Their plan was simple: streets running east-west, avenues running north-south, creating a relentless grid of blocks 200 feet wide and 600 to 900 feet long. They didn't try to predict where the commercial center would be, where the wealthy would live, or where industry would locate. They just provided a neutral framework that could accommodate any of these uses. The physical implementation was equally straightforward and equally important. Over the following decade, surveyors went out and marked the future street corners with large stone monuments. This transformed the plan from paper to reality. Property owners could see where future streets would run. They could build with confidence, knowing their building wouldn't be demolished for a future street. The city could acquire rights-of-way gradually as needed. John Randel Jr., the surveyor who executed the plan, was obsessive about precision. When he realized that accumulated small errors would throw off the grid by the time it reached the northern part of the island, he wrote to the city council requesting permission to add exactly 0.669 feet to each block. That's 8.02 inches. This was not an approximation. It was an exact specification that would lock property lines in place for centuries.[^3] ![[randall-map.png]] A master street plan does five things: They free up municipal resources. As a pre-approved subdivision plat for an entire city, a master street plan streamlines development review. Planners don't need to evaluate each street proposal from scratch. They just check whether it conforms to the plan. If a developer wants to deviate, they need to request a variance, flipping the burden of proof. This frees planning staff to focus on other issues like affordable housing, design quality, and community services. They save developers time and money. When the street locations are already determined and approved, developers can move straight to building. No lengthy negotiations about street connections. No expensive studies to determine optimal layouts. No risk that a neighboring development will create an incompatible pattern. The reduced time and cost gets passed on to homebuyers and renters. They ensure connectivity. This might be the most important benefit. Without a master plan, each development is an island, connecting to existing streets but not thinking about future connections. Without a master plan, cul-de-sacs and dead ends multiply. With a master plan, every development leaves connection points for future neighbors. The street network grows organically but coherently. They create a shared vision. A master street plan gives everyone (developers, residents, officials) a common image of what they're building toward. This shared vision can survive changes in political leadership, economic cycles, and development trends. They maximize urban potential. Every street creates valuable frontage where private meets public. This frontage is where the city's economic and social life happens: shop windows facing the sidewalk, residents watching the street, strangers bumping into each other. A well-connected street network with appropriate block sizes maximizes it. A disconnected network wastes land on internalized parking and buffers that contribute nothing to city life. What makes a good master street plan? First, it must be precise. This isn't a conceptual diagram or a general indication. It's a legal document showing exact locations where public rights-of-way will be established. Every line represents a future property boundary that will outlive the paper it's drawn on. Second, it must be comprehensive. A partial plan is barely better than no plan. The whole point is to see how all the pieces fit together, to ensure connectivity across the entire jurisdiction. This doesn't mean the entire plan gets built at once (Manhattan's took over a century) but it all gets planned at once. Third, it must be neutral about use. The moment you start designing streets for specific uses, you lose flexibility. A 300-foot block works equally well for residences or offices. The street pattern shouldn't predetermine what goes where. Finally, it must be legally adopted. A plan sitting in a drawer helps no one. The plan needs official status so developers know they can rely on it, so the city can protect or acquire rights-of-way based on it, so surveyors can stake it in the field. Today, master street plans are rarely used, though the statutes that authorize them are still on the books in many states. A few cities maintain something they call a "thoroughfare plan" or "major street plan," but these typically show only highways and arterials, the biggest streets that carry regional traffic. They ignore the local street network where most of urban life happens. A blueprint that shows only the beams and leaves every subcontractor to guess where the walls go would give you a building that stands but does not work. The consequences of this abandonment are visible in every postwar suburb: disconnected street networks that force all traffic onto a few overburdened roads, residential areas isolated from commercial services, the inability to walk anywhere, the impossibility of adding transit, the resistance to change of any kind. We abandoned the tool just when we needed it most, during the greatest period of city-building in American history. The result has been expensive, unsustainable, and isolating. But the tool still exists. The principles still work. Cities that want to build places that will thrive for centuries, not just decades, can pick it up again: draw the picture on the puzzle box, plan their streets (all their streets), and trust the city to grow within that permanent framework, as cities have done for millennia. The next chapter explains how we lost this essential tool, and why getting it back is so urgent. --- Continue to [[Chapter 3 - How We Lost Our Way]] → [^1]: _Remarks of the Commissioners for Laying out Streets and Roads in the City of New York, Under the Act of April 3, 1807_ (1811). [^2]: Jane Jacobs, _The Death and Life of Great American Cities_ (New York: Random House, 1961), chapter 2. [^3]: On Randel's survey and the monuments, see Hilary Ballon, ed., _The Greatest Grid: The Master Plan of Manhattan, 1811–2011_ (New York: Columbia University Press, 2012), and Marguerite Holloway, _The Measure of Manhattan_ (New York: W. W. Norton, 2013). --- Annotations: 0,15844 SHA-256 2e4a52eafd2d256e281a &Claude: 5527,11 9259,33 10707,38 @Paul Knight: ...