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A planned unit development ( PUD ) is a type of flexible, non- Euclidean zoning device that redefines the land uses allowed within a stated land area. PUDs consist of unitary site plans that promote the creation of open spaces, mixed-use housing and land uses, environmental preservation and sustainability, and development flexibility. Areas rezoned as PUDs include building developments, designed groupings of both varied and compatible land uses —such as housing , recreation , commercial centers, and industrial parks —within one contained development or subdivision . Developed areas vary in size and by zoned uses, such as industrial, commercial, and residential. Other types of similar zoning devices include floating zones, overlay zones, special district zoning, performance-based codes , and transferable development rights .

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71-397: Arca South is a 74-hectare (180-acre) planned unit development owned by Ayala Land, Inc. located at East Service Road, Barangay Western Bicutan , Taguig . It was formerly part of Food Terminal Inc. before being sold to Ayala Land. With the decline of FTI, established in 1974, there have been several attempts over multiple Philippines presidential administrations to sell off part of

142-455: A PUD provides flexibility to create convenient ways for residents to access commercial and other amenities. In the US, residents of a PUD have an ongoing role in management of the development through a homeowner's association . Pattern zoning is a zoning technique in which a municipality provides licensed, pre-approved building designs, typically with an expedited permitting process. Pattern zoning

213-516: A combination of private and public planning. Other critics of zoning argue that zoning laws are a disincentive to provide housing which results in an increase in housing costs and a decrease in productive economic output. For example, A 2017 study showed that if all states deregulated their zoning laws only halfway to the level of Texas, a state known for low zoning regulations, their GDP would increase by 12 percent due to more productive workers and opportunity. Furthermore, critics note that it impedes

284-524: A community approves a PUD. The flexibility to include multiple amenities—like utilities, recreational facilities, schools, and parks—within a development unit is representative of how untraditional, Euclidean zoning practices can increase the mixed-use capability of a given piece of land. PUD project plans require a balance of residential, such as single-family homes and apartments, and non-residential requirements, ensuring that interacting individuals and vehicles are able to safely, and conveniently, navigate

355-586: A compact geographic area. The mixing of land uses is common throughout the world. Mixed-use zoning has particular relevance in the United States, where it is proposed as a remedy to the problems caused by widespread single-use zoning. Form-based or intensity zoning regulates not the type of land use, but the form that land use may take. For instance, form-based zoning in a dense area may insist on low setbacks, high density, and pedestrian accessibility. Form-based codes (FBCs) are designed to directly respond to

426-404: A compatible group of uses are allowed to co-exist - or a combination of both single and mixed-use zones in one system. The main approaches include use-based, form-based, performance and incentive zoning. There are also several additional zoning provisions used in combination with the main approaches. Use-based or functional zoning systems can comprise single-use zones, mixed-use zones—where

497-400: A compatible group of uses are allowed to co-exist —or a combination of both single- and mixed-use zones in one system. The primary purpose of single-use zoning is to geographically separate uses that are thought to be incompatible. In practice, zoning is also used to prevent new development from interfering with existing uses and/or to preserve the character of a community. Single-use zoning

568-539: A direct percentage of gross acreage; approval from a planning board on the proposed location of the public, open space; or cosigned maintenance agreements between residents —regardless of whether it be by a municipality or an organized residential community, like a homeowner' association or a community trust. The requirement of these aforementioned revisions is to ensure that open, public land, facilities, amenities, and necessities are well-kept for ease of public use and accessibility. Street patterns can be used to change

639-505: A free economy, as poor zoning restrictions hinder the more efficient usage of a given area. Even without zoning restrictions, a landfill, for example, would likely gravitate to cheaper land and not a residential area. Single-use zoning laws can get in the way of creative developments like mixed-use buildings and can even stop harmless activities like yard sales. The Houston example of non-zoning or private zoning with no restriction on particular land use but with other development code shows

710-584: A high degree of flexibility, but may be complex to administer. The more a proposed development takes advantage of incentive criteria, the more closely it has to be reviewed on a discretionary basis. The initial creation of the incentive structure in order to best serve planning priorities also may be challenging and often requires extensive ongoing revision to maintain balance between incentive magnitude and value given to developers. Incentive zoning may be most effective in communities with well-established standards and where demand for both land and for specific amenities

781-405: A maximum number of units per acre or a minimum lot acre per each dwelling unit. Uses permitted is determined by allotting certain percentages of land use to residential, commercial, and industrial uses. Oftentimes, the amount allotted is dependent on the percentage of residential uses relative to non-residential uses within a defined area. Given that PUDs focus on integrating mixed uses into

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852-424: A menu of compliance options where a property developer can earn points or credits for limiting environmental impacts, including affordable housing units, or providing public amenities. In addition to the menu and points system, there may be additional discretionary criteria included in the review process. Performance zoning may be applied only to a specific type of development, such as housing, and may be combined with

923-431: A number of sub-categories, for example, within the commercial category there may be separate districts for small retail, large retail, office use, lodging and others, while industrial may be subdivided into heavy manufacturing, light assembly and warehouse uses. Special districts may also be created for purposes like public facilities, recreational amenities, and green space. The application of single-use zoning has led to

994-422: A property owner and a local government to rezone a property in exchange for a commitment from the developer. It typically involves loosening restrictions on how the property can be used. Contract zoning is controversial and sometimes prohibited because it deviates from the broader planning process and has been considered an illegal bargaining away of the government's police powers to enforce zoning. Fiscal zoning

1065-418: A quasi-judicial process that enables land uses that, because of their special nature, may be suitable only in certain locations, or when arranged or operated in a particular manner. Uses which might be disallowed under current zoning, such as a school or a community center, can be permitted via conditional-use permits. Contract zoning is a controversial practice in which there is a bilateral agreement between

1136-425: A reduction in lot sizes. The term planned unit development (PUD) can refer either to the regulatory process or to the development itself. A PUD groups multiple compatible land uses within a single unified development. A PUD can be residential, mixed-use, or a larger master-planned community. Rather than being governed by standard zoning ordinances, the developer negotiates terms with the local government. At best,

1207-593: A single space. Mixed-use zoning can be vertical, within a single building, or horizontal, involving multiple buildings. Planning and community activist Jane Jacobs wrote extensively on the connections between the separation of uses and the failure of urban renewal projects in New York City. She advocated dense mixed-use developments and walkable streets . In contrast to villages and towns, in which many residents know one another, and low-density outer suburbs that attract few visitors, cities and inner city areas have

1278-549: A specified area, density is calculated based on the Federal Housing Act 's Land Use Intensity (LUI) rating, which encompasses floor area, open space, livability, and recreational spaces within a single, numerical rating. Houses in PUDS often include access to a large, shared open space surrounding the house, as well as a smaller, private yard. Clustered residential homes and buildings also provides homeowners with lower prices, in

1349-531: A system of use-based districts. Performance zoning is flexible, logical, and transparent while offering a form of accountability. These qualities are in contrast with the seemingly arbitrary nature of use-based zoning. Performance zoning can also fairly balance a region's environmental and housing needs across local jurisdictions. Performance zoning balances principles of markets and private property rights with environmental protection goals. However, performance zoning can be extremely difficult to implement due to

1420-505: A very flexible form of zoning , as compared to Euclidean zoning , in that PUDs promotes innovative and creative design, can promote environmental conservation and affordable housing , clustering and increased density. Where appropriate, this type of development promotes: Frequently, PUDs take on a variety of forms ranging from small clusters of houses combined with open spaces to new and developing towns with thousands of residents and various land uses. PUDs are in direct contradiction to

1491-434: Is a broad term that consists of several alternatives to use-based zoning that incorporate information and communication technologies. There are a number of different techniques to accomplish smart zoning. Floating zones, cluster zoning, and planned unit developments (PUDs) are possible—even as the conventional use-based code exists —or the conventional code may be completely replaced by a smart performance or form-based code, as

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1562-425: Is a controversial practice in which a small part of a larger zoning district is rezoned in a way that is not consistent with the community's broader planning process. While a jurisdiction can rezone even a single parcel of land in some cases, spot zoning is often disallowed when the change would conflict with the policies and objectives of existing land-use plans. Other factors that may be considered in these cases are

1633-507: Is a controversial practice in which local governments use land use regulation, including zoning, to encourage land uses that generate high tax revenue and exclude uses that place a high demand on public services. Environmental activists argue that putting everyday uses out of walking distance of each other leads to an increase in traffic, since people have to own cars in order to live a normal life where their basic human needs are met, and get in their cars and drive to meet their needs throughout

1704-616: Is a zoning district that overlaps one or more zoning districts to address a particular concern or feature of that area, such as wetlands, historic buildings or transit-oriented development . Overlay zoning has the advantage of providing targeted regulation to address a specific issue, such as a natural hazard, without having to significantly rewrite an existing zoning ordinance. However, development of overlay zoning regulation often requires significant technical expertise. Transferable development rights, also known as transfer of development credits and transferable development units, are based on

1775-663: Is designed as an access to Arca South estate while the TITX is under construction. Planned unit development The conceptual origins of PUDs date back to the 1926 enactment of the Model Planning Enabling Act of 1925 by the Committee on the Regional Plan of New York, which allowed for the decisions of planning boards and commissions to precede decisions required by local zoning regulations. Specifically, Section 12 of

1846-493: Is high. However, hidden costs may still offset its benefits. Incentive zoning has also been criticized for increasing traffic, reducing natural light, and offering developers larger rewards than those reaped by the public. Additional zoning provisions exist that are not their own distinct types of zoning but seek to improve existing varieties through the incorporation of flexible practices and other elements such as information and communication technologies (ICTs). Smart zoning

1917-450: Is the ability to create flexible zoning districts for smoother transitions between adjacent properties with different uses. Inclusionary zoning refers to policies to increase the number of housing units within a development that are affordable to low and middle-income households. These policies can be mandatory as part of performance zoning or based on voluntary incentives, such as allowing greater density of development. An overlay zone

1988-428: Is used to reduce barriers to housing development, create more affordable housing, reduce burdens on permit-review staff, and create quality housing designs within a certain neighborhood or jurisdiction. Pattern zoning may also be used to promote certain building types such as missing middle housing and affordable small-scale commercial properties. In some cases, a municipality purchases design patterns and constructs

2059-723: Is where only one kind of use is allowed per zone, or district. It is also known as exclusionary zoning or, in the United States, as Euclidean zoning because of a court case in Euclid, Ohio , Village of Euclid, Ohio v. Ambler Realty Co. 272 U.S. 365 (1926), which established its constitutionality. It has been the dominant system of zoning in North America, especially the United States , since its first implementation. Commonly defined single-use districts include: residential, commercial, and industrial. Each category can have

2130-523: The Department of Agrarian Reform . The remaining 46 hectares (110 acres) remains in FTI. In 2013, Ayala Land renamed their property into Arca South. Current construction of the mall is estimated to be completed by 2027, ten years after its initial target date. Ayala Land Premier Alveo Land Avida Land The planned North–South Commuter Railway and Metro Manila Subway 's FTI station will be connected to

2201-621: The New Urbanism movement. To accommodate the New Urbanist vision of walkable communities combining cafés , restaurants , offices and residential development in a single area, mixed-use zones have been created within some zoning systems. These still use the basic regulatory mechanisms of zoning, excluding incompatible uses such as heavy industry or sewage farms , while allowing compatible uses such as residential, commercial and retail activities so that people can live, work and socialise within

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2272-551: The Roman Empire (31 BC – 476 AD). Throughout the Age of Enlightenment and Industrial Revolution , cultural and socio-economic shifts led to the rapid increase in the enforcement and invention of urban regulations. The shifts were informed by a new scientific rationality, the advent of mass production and complex manufacturing, and the subsequent onset of urbanisation. Industry leaving the home reshaped modern cities. The definition of home

2343-822: The Taguig Integrated Terminal Exchange (TITX) , which is located in Arca South. In addition to its surrounding access roads, particularly those connecting it with the East Service Road, Arca South is also expected to be served by the Skyway-FTI Interchange of the Southeast Metro Manila Expressway , which will also connect it to the Skyway . The two- hectare Arca South Transport Terminal, operated by ALI partner Interlux Corporation

2414-564: The United States with the Los Angeles zoning ordinances of 1904 and the New York City 1916 Zoning Resolution . There are a great variety of zoning types, some of which focus on regulating building form and the relation of buildings to the street with mixed uses, known as form-based, others with separating land uses, known as use-based, or a combination thereof. Use-based zoning systems can comprise single-use zones, mixed-use zones - where

2485-582: The single-type zoning that has traditionally underscored zoning in the United States since the Village of Euclid v. Ambler Realty Co. decision. Within PUDs, zoning becomes much more integrated with multiple land uses and districts being placed on adjacent land parcels. The enactment of the Standard Zoning Enabling Act (SZEA) reinforced that density is considered a regulatory priority, further supporting

2556-568: The Model Planning Enabling Act authorized planning boards and commissions to reasonably modify or change development plans and limited average population density and total land area covered by buildings. Similarly, Sections 14 and 15 of the Standard City Planning Enabling Act of 1928 allowed planning commissions to authorize PUDs, upon an agreement between the government and developers on the PUD's design principles and its impact to both

2627-624: The ability of those that wish to provide charitable housing from doing so. For example, in 2022, Gloversville's Free Methodist Church in New York wished to provide 40 beds for the homeless population in -4 degree weather and were inhibited from doing so. Corruption is a challenge for zoning. Some have argued that zoning laws increase economic inequality . Empirical effectiveness estimates show some zoning approaches can contribute to housing crisis . The legal framework for land use zoning in Australia

2698-435: The area. Though American new communities had to attract industry post-development of residential sectors, American new communities had similar economic needs to these British towns and, consequently, used PUDS to increase the percent of allowed industrial acreage relative to residential and nonresidential acreage. PUD is a means of land regulation that promotes large scale, site-specific, mixed-use land development. PUDs are

2769-624: The case in London or New York. The construction of the Montparnasse Tower in 1973 led to an outcry. As a result, two years after its completion the construction of buildings over seven storeys high in the city centre was banned. Performance zoning, also known as flexible or impact zoning or effects-based planning, was first advocated by Lane Kendig in 1973. It uses performance-based or goal-oriented criteria to establish review parameters for proposed development projects. Performance zoning may use

2840-407: The case of form-based zoning, the differing regulations may govern the density, size and shape of allowed buildings whatever their use. The planning rules for each zone determine whether planning permission for a given development may be granted. Zoning may specify a variety of outright and conditional uses of land. It may indicate the size and dimensions of lots that land may be subdivided into, or

2911-482: The city of Miami did in 2019. The incorporation of ICTs to measure metrics such as walkability , and the flexibility and adaptability that smart zoning can provide, have been cited as advantages of smart zoning over "non-smart" performance or form-based codes. Floating zones describe a zoning district's characteristics and codify requirements for its establishment, but its location remains unspecified until conditions exist to implement that type of zoning district. When

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2982-452: The community's desired character and intensity of development. The French planning system is mostly form-based; zones in French cities generally allow many types of uses. The city of Paris has used its zoning system to concentrate high-density office buildings in the district of La Défense rather than allow heritage buildings across the city to be demolished to make way for them, as is often

3053-634: The complexity of preparing an impact study for each project, and can require the supervising authority to exercise a lot of discretion. Performance zoning has not been adopted widely in the US. Incentive zoning allows property developers to develop land more intensively, such as with greater density or taller buildings, in exchange for providing some public benefits, such as environmental amenities or affordable housing units. The public benefits most often incentivised by US cities are "mixed-use development, open space conservation, walkability, affordable housing, and public parks." Incentive zoning allows for

3124-427: The concept that with land ownership comes the right of use of land, or land development . These land-based development rights can, in some jurisdictions, be used, unused, sold, or otherwise transferred by the owner of a parcel. These are typically used to transfer development rights from rural areas (sending sites) to urban areas (receiving sites) with more demand and infrastructure to support development. Spot zoning

3195-514: The criteria for implementation of a floating zone are met, the floating zone ceases "to float" and its location is established by a zoning amendment. Cluster zoning permits residential uses to be clustered more closely together than normally allowed, thereby leaving substantial land area to be devoted to open space. Cluster zoning has been favored for its preservation of open space and reduction in construction and utility costs via consolidation, although existing residents may often disapprove due to

3266-538: The day. Single-use zoning and urban sprawl have also been criticized as making work–family balance more difficult to achieve, as greater distances need to be covered in order to integrate the different life domains. These issues are especially acute in the United States, with its high level of car usage combined with insufficient or poorly maintained urban rail and metro systems. Some economists claim that zoning laws work against economic efficiency, reduce responsiveness to consumer demands and hinder development in

3337-524: The development of PUDs through the integration of varying lot sizes, varied building uses, and the mixture of different types of housing. PUDS combine residential and non-residential uses—like offices, commercial stores, and other services—and attracts a diversified community. Notably, sidewalks and streets of PUDs tend to be more active and safer, both at day and night, and experiences reduced congestion during peak times. Detailed plans and review processes are required to approve development of PUDs, due to

3408-404: The developmental unit consisted of multiple land uses, in contrast to the county's previous commitment to single-land use Euclidean zoning . The usage of PUDs in new American communities have been, in part, the result of some international influence; British towns, like Reston, England , in the 1950s attempted to increase their economic base through the integration of industrial elements into

3479-452: The distinctive form of many cities in the United States , Canada , Australia , and New Zealand , in which a very dense urban core , often containing skyscrapers , is surrounded by low density residential suburbs , characterised by large gardens and leafy streets . Some metropolitan areas such as Minneapolis–Saint Paul and Sydney have several such cores. Mixed-use zoning combines residential, commercial, office, and public uses into

3550-551: The form and scale of buildings. These guidelines are set in order to guide urban growth and development. Zoning is the most common regulatory urban planning method used by local governments in developed countries. Exceptions include the United Kingdom and the City of Houston , Texas . Most zoning systems have a procedure for granting variances (exceptions to the zoning rules), usually because of some perceived hardship caused by

3621-419: The form of lower infrastructural costs from shorter streets and by offering a mix of single-family , two-family, multiple-family housing. PUDs can be considered a legal alternative to large lot, single-family zoning for how the land area can increase residential housing available while maintaining a small impact on local property taxes. Homes can be placed next to commercial and office land uses, while ensuring

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3692-415: The increasing need for higher suburban density to accommodate rising population sizes. PUDs resolved the problems of large-scale, suburban development in multiple, separate land uses were efficiently combined, preserving valuable open space and suburban aesthetics within specific site parameters limitations. The first zoning evidence of PUD was created by Prince George's County, Maryland in 1949, in which

3763-500: The maintenance of common, public areas; such provisions include related costs, income level and interests of stakeholders, and the nature of both the common area and surrounding developments. Throughout the development process, which is already scheduled and preapproved as part of the PUD application process, maintenance of common areas can be sustained through calculated servicing of inroads. Post-development, governing documents of homeowners associations within PUDs often delegate most of

3834-426: The maintenance responsibilities to the owners, assuming the least amount of responsibility possible. The minimum parcel size requirement can be in regards to either dwelling units or acres and can vary depending on both the type and location of a development. Given that minimum parcel sizes are a factor rarely necessary for project approval, maximum density requirements are more often used instead, focusing on either

3905-410: The management capacity of local developers. There are multiple provisions PUDs must include in regards to available open spaces, which include, upon conditional approval, those concerning quantity, location, and maintenance of public areas. Approval for such provisions can be satisfied by one of the following: satisfying a minimum acreage requirement relative to a specific number of dwelling units or

3976-434: The nature of mixing residential and non-residential uses into land areas previously only allowed for single-use; approving a PUD essentially requires a legal rezoning, in which variances and conditional use permits must be cleared by a planning board or commission with regards to the municipality's comprehensive plan . PUD provisions include consideration of the ability of the owners, or related stakeholders, to ensure

4047-535: The neighborhood character of a residential community, particularly by allowing developers to flexibly arrange buildings without having to adhere to non-PUD zoning regulations. Wide, curvilinear, and cul-de-sac street patterns are examples. The usage of these street, round street patterns allow developers to cluster buildings and maximize available open space. Existing street and block patterns, historic preservation , and reservation of ground-floor streetfronts for non-residential, commercial uses are also considered when

4118-458: The particular nature of the property in question. The origins of zoning districts can be traced back to antiquity . The ancient walled city was the predecessor for classifying and regulating land, based on use. Outside the city walls were the undesirable functions, which were usually based on noise and smell. The space between the walls is where unsanitary and dangerous activities occurred such as butchering, waste disposal, and brick-firing. Within

4189-427: The physical structure of a community in order to create more walkable and adaptable environments. Form-based zoning codes have five main elements: a regulating plan, public standards, building standards, and precise definitions of technical terms. Form-based codes recognize the interrelated nature of all components of land-use planning—zoning, subdivision, and public works—and integrate them to define districts based on

4260-497: The preservation of other areas. Homes, however, often visually feature garages instead of front porches, as they are placed in the periphery, relative to small strip malls created through other PUD initiatives. Smaller-sized PUDs, generally less than 250 acres, can promote the mixed-use of the development, but, because they are too small to influence nearby development, can contribute to sprawl in nearby peripheral and rural areas. In smaller PUDs, offering shopping facilities for only

4331-423: The problem of maintaining order between strangers. This order is maintained when, throughout the day and evening, there are sufficient people present with eyes on the street . This can be accomplished in successful urban districts that have a great diversity of uses, creating interest and attracting visitors. Jacobs' writings, along with increasing concerns about urban sprawl, are often credited with inspiring

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4402-513: The properties themselves while in other cases the municipality offers the patterns for private development. A hybrid zoning code combines two or more approaches, often use-based and form-based zoning. Hybrid zoning can be used to introduce form and design considerations into an existing community's zoning without completely rewriting the zoning ordinance. Composite zoning is a particular type of hybrid zoning that combines use, form, and site design components: An advantage of composite zoning

4473-471: The property, including a public auction in 2009, but they all failed. In November 2012, the Philippine government announced the sale of the 74 hectares (180 acres) or 62% of the 120-hectare (300-acre) property to Ayala Land, Inc. for ₱ 24.3 billion . Ayala plans to turn the property into a mixed-use development . Proceeds from the sale are pledged to the programs of the Department of Agriculture and

4544-587: The residents may not be sustainable or viable for the development. Mid-sized PUDs, generally greater than 250 acres but less than 1000 acres, can maintain a balance between developmental influence to nearby areas, while still maintaining adequate cash flow requirements. Moderately-sized PUDs also contribute to the development of commercial highways and residential areas, which can increase the ability of smaller-areas of land being more efficiently developed or used. Larger-sized PUDs, generally greater than 1000 acres, can control sprawl-related issues, yet may also strain

4615-621: The size of the parcel, the zoning categories involved, how adjacent properties are zoned and used, and expected benefits and harms to the landowner, neighbors, and community. Conditional zoning is a legislative process in which site-specific standards and conditions become part of the zoning ordinance at the request of the property owner. The conditions may be more or less restrictive than the standard zoning. Conditional zoning can be considered spot zoning and can be challenged on those grounds. Conditional zoning should not be confused with conditional-use permits (also called special-use permits ),

4686-503: The surrounding community and economy. The physical origins of PUDs are rooted in the increased suburbanization of the mid-twentieth century, during which the oldest forms of PUDs in America appeared shortly after World War II in the Levittown and Park Forest developments. Increased implementation of PUDs arose in response to both the lack of aesthetic variation among suburban homes and

4757-500: The varied buildings, spaces, and streets of PUDs. Ownership and responsibility of such PUDs may be either public or private. Zoning In urban planning , zoning is a method in which a municipality or other tier of government divides land into "zones", each of which has a set of regulations for new development that differs from other zones. Zones may be defined for a single use (e.g. residential , industrial ), they may combine several compatible activities by use, or in

4828-634: The walls were civic and religious places, and where the majority of people lived. Beyond distinguishing between urban and non-urban land, most ancient cities further classified land types and uses inside their walls. This was practiced in many regions of the world – for example, in China during the Zhou Dynasty (1046 – 256 BC), in India during the Vedic Era (1500 – 500 BC), and in the military camps that spread throughout

4899-724: Was designed by Colonel William Light in 1836 in order to physically separate the city centre from its suburbs. Low density residential areas surround the park, providing a pleasant walk between work in the city within and the family homes outside. Sir Ebenezer Howard , founder of the garden city movement , cited Adelaide as an example of how green open space could be used to prevent cities from expanding beyond their boundaries and coalescing. His design for an ideal city, published in his 1902 book Garden Cities of To-morrow , envisaged separate concentric rings of public buildings, parks, retail space, residential areas and industrial areas, all surrounded by open space and farmland. All retail activity

4970-535: Was tied to the definition of economy, which caused a much greater mixing of uses within the residential quarters of cities. Separation between uses is a feature of many planned cities designed before the advent of zoning. A notable example is Adelaide in South Australia , whose city centre, along with the suburb of North Adelaide , is surrounded on all sides by a park, the Adelaide Park Lands . The park

5041-516: Was to be conducted within a single glass-roofed building, an early concept for the modern shopping centre inspired by the Crystal Palace . However, these planned or ideal cities were static designs embodied in a single masterplan . What was lacking was a regulatory mechanism to allow the city to develop over time, setting guidelines to developers and private citizens over what could be built where. The first modern zoning systems were applied in

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