Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
Cities of the sky are urban systems that organize homes, workplaces, public spaces, transport and ecological functions across a city’s height and depth—not simply tall buildings with many floors. They can help cities accommodate growth where land is scarce, but height alone does not make a project sustainable or a true “city within a city.” The decisive questions are how people move through it, whether its public spaces are genuinely accessible, how it connects to the surrounding street and transit network, and who benefits from its development.
What does “cities of the sky” mean?
“Cities of the sky” is a way to describe urban life arranged in three dimensions. It encompasses high-rise buildings, elevated walkways and gardens, underground networks, multi-level public spaces and the movement between them. The idea is broader than a single skyscraper: it asks how the functions and relationships of a city can extend upward and below ground.
As an Amazon Associate I earn from qualifying purchases.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
A 2026 review in Geography Compass describes vertical urbanism as a field spanning high-rise towers, underground networks, elevated infrastructure, multi-level public spaces and self-built settlements. Its research themes include vertical imaginaries, mobility and lived experience. In practical terms, this means evaluating not only a building’s floor area and silhouette, but also how its spaces are reached, used, governed and experienced.
In a foundational paper for the Council on Tall Buildings and Urban Habitat, Mir M. Ali and Paul J. Armstrong describe the supertall building as both a “city within a city” and a “city in the sky.” They also emphasize that creating one requires collaboration across architecture, engineering, planning and construction. A tall mixed-use building can contain several urban functions, but it does not automatically operate as a connected district. That depends on the spaces and systems linking those functions—to one another and to the city outside.
Popular on Amazon
- Ergonomically Designed: Work in tight areas with a compact design that gets into tough spots
- Both tools are designed to fit into difficult to reach spaces
- Complete a wide range of applications with a high-performance motor that delivers up to 300 UWO, and an impact driver delivering up to 1,400 in-lbs of torque
- Both the DEWALT impact driver and drill driver feature integrated LED work lights with a convenient 20-second delay, ensuring enhanced visibility in dimly lit or challenging work areas
- One-Handed Loading - Keep one hand free with a 1/4 in. hex chuck that accepts 1 in. bit tips
Gensler’s account of vertical urbanism makes a similar point about the full urban section: city life extends from transit sub-basements to tower roofs. Public space may be created underground, at ground level, on rooftops or in the sky. The challenge is to make those layers work as a coherent public realm rather than a collection of disconnected interiors.
Why do cities try to grow upward?
Vertical development is one response to population growth, scarce or expensive land, limits on outward expansion and pressure on transport and services. It can put more homes, jobs and amenities within a limited area, but whether that improves urban life depends on the quality of the connections and infrastructure built alongside the density.
A 2025 review in Energies reports that 55% of the world’s population lives in cities, with 68% projected to do so by 2050; it says 90% of urban population growth is expected in Asia and Africa. The same review reports that 144 buildings at least 200 metres tall were completed worldwide in 2017, half of them in China. Those figures show the scale of urbanization and tall-building construction, but they do not prove that high-rise development is the right response in every location.
The case for building upward is strongest when density supports a more integrated urban system: a mix of useful destinations, transit access, safe walking routes and public services. Combining uses may shorten some everyday trips. Concentrating development may also reduce pressure to expand into surrounding land. But these benefits are potential outcomes, not automatic properties of height. A tower that depends on car travel, separates uses behind private lobbies or lacks public services may add floor area without making a district more connected.
Context matters. The CTBUH paper argues that tall buildings must be judged in relation to culture, climate, services, infrastructure and street-level life. A design that works in one city cannot simply be assumed to work in another. Local mobility patterns, climate, land ownership and existing neighborhoods all affect whether vertical growth becomes an extension of urban life or a self-contained enclave.
How can a vertical project function as a city?
A vertical project starts to behave like part of a city when its uses, circulation, public spaces and services support ordinary daily life. A useful way to assess a proposal is to trace the experience of a person who arrives, moves through it, uses its shared spaces and continues on to the surrounding neighborhood.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Also popular on Amazon
- Valued Carpenter Pencil Set: You will get 2 pcs solid carpenter pencils with 26 piece 2.8 mm refills, 1 replaceable sharpener, 1 plastic storage box.The complete carpenter pencils combination allows you to finish your work faster and more easily
- Deep Hole Marker Pencil: The deep-hole construction pencils adopts 45mm elongated tip design, which is more convenient to mark in the small hole or in other tight areas that other carpenter markers cannot reach
- Carpenter Pencils with Sharpener: The sharpener is screwed into the top of the work pencil, which won't get lost either. Built-in pencil sharpener that keep the lead with pointed and smooth to Improves line of sight in fine work
- Stronger Solid Lead: This work pencil is matched with a 2.8 mm thick lead , which is much thicker and stronger during the drawing process of construction work, it will not break or damage easily
- Marks on Various Surfaces: 3 colors solid construction pencil can marks on various surfaces,such as metal, plastic, wood, paper etc. Ideals for woodworkers, contractors, craftsmen, builders, merchants and masons
- Start with the program mix. Identify what the project contains—such as homes, offices, retail, hospitality, education, culture or recreation—and whether those uses complement one another. Mixed use can bring destinations closer together, but a list of uses does not explain who can reach them or when they are active.
- Map the routes between uses. Follow the connections from street and transit entrances to building lobbies, shared facilities, upper levels and adjacent buildings. Note where a route is public, controlled or limited to occupants, and whether it is a direct everyday path or merely a symbolic bridge.
- Test publicness. Ask who can enter each plaza, garden, walkway or elevated level; whether entry is free; what hours apply; and who sets the rules. A visually open space may still be privately controlled or difficult for ordinary visitors to access.
- Evaluate human scale. Check whether people can understand the layout, find destinations, rest and meet others. Daylight, shelter, legible wayfinding and a comfortable relationship to the street help shared spaces function as more than circulation areas.
- Connect environmental systems to the urban experience. Examine greenery, rainwater, energy, solar exposure and ventilation alongside their maintenance and microclimate effects. A garden or sustainability label is not, by itself, evidence of good environmental performance.
- Consider urban consequences and adaptability. Ask how development affects existing communities, heritage, access and displacement. Consider whether spaces and circulation can respond as population, climate, transport or technology changes.
This is also a construction and coordination challenge. The building, its shared spaces and the public realm need to be understood as related parts of one project. The CTBUH authors’ emphasis on collaboration across disciplines is important because decisions about structure, circulation, services, public access and urban planning influence one another. A scheme may offer many activities yet fail as a vertical district if the routes between them are confusing, inaccessible or disconnected from its surroundings.
What do built projects show about vertical urbanism?
Examples often grouped under the “city in the sky” idea illustrate different strategies, not interchangeable models. Comparing them by program, publicness, connections, environmental approach and relationship to the city helps distinguish a layered urban experience from a tall building with a compelling image.
Marina One: a garden at the center of a dense development
Marina One in Singapore combines four tall buildings, offices and 1,042 apartments intended for about 3,000 residents. Its central Green Heart is a 37,000-square-metre tropical garden with more than 350 plant species. The Energies review also notes sky gardens, ventilation between building masses, transit connections, bicycle parking, electric-vehicle charging and LEED Platinum certification.
The project is useful for discussing how greenery and shared space can be integrated into a dense mixed-use scheme. The important qualification is that the presence of a large garden does not settle the question of publicness. Readers assessing a similar project should ask whether its central space is open to the wider public, how it is managed and whether people who do not live or work there can use it comfortably. Certification and plant counts do not answer those questions on their own.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallRaffles City Chongqing: an elevated corridor as a major layer
Raffles City sits in Chongqing’s dense Yuzhong district. Its six towers rise from a retail podium: two are 350 metres tall and four are 250 metres tall. The Crystal, a 300-metre-long, 15,000-square-metre elevated corridor, contains gardens, dining, exhibition areas, a pool, a hotel lobby and an observatory, according to the Energies review.
The Crystal makes the idea of a city in the sky tangible by placing several functions in a substantial elevated space. It also raises the questions that any ambitious skybridge or sky garden should face: who controls access, which activities are available to whom, and how the elevated layer connects to ordinary street life. The broader urban consequences matter too. Research on Chongqing highlighted in the vertical-urbanism review places control of elevated public space alongside concerns about older neighborhoods displaced as spectacular projects replace them. A striking elevated destination is not a substitute for examining what happened to the places and communities around it.
Also popular on Amazon
- 【Great Compatibility】This Katerk 1/4 inch hex shank bit holder is specifically designed for 1/4 inch hex shank drill bits. It's compatible with most 1/4 fast hex handles, hex sockets, various electric screwdrivers, and handheld screwdrivers. The bit holder makes it a valuable addition for any handyman.
- 【Secure and Safe】Built with a secure backup nut design, each drill bit holder securely locks onto your bits, ensuring they stay firmly in place. Additionally, our bit holder incorporates a high-quality steel ball rolling design that holds up to several kilograms of weight, ensuring your various drill bits don't fall off.
- 【Easy One-Handed Operation】The bit holder for impact driver allows you to change bits single-handedly, simplifying your workflow. Its multi-color design further allows for quick identification of the drill bit you need.
- 【Compact and Convenient】Thanks to its compact size, this 1/4 inch bit holder is easy to carry around. The bit holder allows for easy attachment to various tools, making this a convenient addition to your construction accessories. The Katerk bit holder is cast from high-quality alloy material, promising a long product lifespan. Despite its rugged strength, the bit holder remains lightweight, making it portable.
- 【Cool Christmas Gift For Men Stocking Stuffers】 This screwdriver bit holder, driver bit holder, impact bit holder, can be given as a gift to your loved one, especially for anyone involved in construction or electrical work. It's a must-have for stocking stuffers for men and women, tools gifts for dad, tech gadgets for men, gifts for dad, gifts for him, gifts for husband, gifts for boyfriend, cool gadgets for men, and cool gifts for dad.
KK100: vertical stacking is not the same as a vertical district
Shenzhen’s KK100 is a 441.8-metre, 100-storey tower completed and occupied in 2011. It combines offices and a hotel, with gardens and restaurants on its four highest floors. It is a clear example of uses stacked vertically within one building.
That arrangement illustrates the distinction between multifunctionality and urban integration. A tower may contain work, hospitality, food and landscaped areas, but the description alone does not tell us how its levels connect to public streets, nearby destinations or everyday transit. The Energies review includes KK100 among examples for discussing building form and function. Its height and program are descriptive facts, not proof that it functions as a self-sufficient or sustainable city.
Free tools Windows power users keep installed
One-click scans. No signup required.
Shanghai Tower and the wider Asian vertical-city model
The Energies review compares Shanghai Tower with Marina One, Raffles City, KK100 and other projects, including CITIC Tower, Guangzhou Chow Tai Fook Finance Center and Shenzhen Ping An Finance Center. Its comparison criteria include form, function, integration with surroundings, human scale, ecological technologies, greenery, accessibility, public space and the projects’ roles in compact urban development.
This broader set matters because no single architectural feature can stand in for a complete evaluation. An iconic shape, a high floor count, planted terraces or a certification may be relevant, but each addresses only part of the question. A fuller assessment asks how the project works at street level, who can use its shared areas, how it relates to transport and neighboring spaces, and what environmental and social effects accompany its construction and operation. The review reports that Shanghai had a permanent population of 24.87 million in 2020, underscoring the urban scale against which proposals for compact development are being discussed.
Do skyways and elevated parks make a city more public?
They can add useful walking routes and public space, but elevation alone does not make a space public. The value of a skyway or elevated park depends on access points, connections to surrounding streets and buildings, management and the activities it supports.
A 2023 study in City, Territory and Architecture defines urban skyways as elevated, pedestrian-friendly layers applied to existing urban fabric. It distinguishes large-scale reuse of infrastructure, such as the High Line in Manhattan, from building-to-building connections such as enclosed skyways in cold-climate cities. In both cases, the design question is whether the raised route strengthens the wider network or creates a destination and circulation system apart from it.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Also popular on Amazon
- Toolwiz 17-inch magnetic sweeper maintaining a load capacity of up to 8.8 pounds provides a perfect solution to the problem of clearing small ferrous metal objects, such as nails, tacks, bolts, and metal shavings from workshops or garage floors.
- Convenient and portable：17” is good for home, small workshop, or small yard as it is space-saving and more reachable for narrow areas. Perfect for collecting nails or small parts in the car, under the table, and in other nooks or crannies.
- Upgraded Handle Design: The handle features a sturdy, non-telescopic design to completely prevent slipping during use. By simply adding or removing the extension poles, the height can be adjusted to 3 different lengths: 18.9" (48 cm), 32.5" (82.5 cm), and 42.5" (108 cm) from ground to top. This customizable height helps prevent back bending and muscle strain, making your cleaning tasks effortless
- Flexible wheels: Upgrade wheel screws to avoid being too tight to spin or too loose. More comfortable 3-inch rubber wheels roll smoothly on carpet, grass, concrete, and hardwood floors. Just push and pull this rolling magnet-sweeper to pick up metal nails easily.
- Lightweight materials: The magnetic nail sweeper's compact and lightweight design makes the sweeping can be done anywhere you want, Push or pull it under the furniture, passing through the workshop floor, driveway, mud, grass, and gravel.
The study identifies limitations in the High Line model: relatively few access points at street level, weak physical connection to surrounding buildings and underused space beneath the structure. Those are not reasons to dismiss elevated parks; they are reminders to design both the upper route and its edges. Frequent, legible access, useful connections to adjacent streets and attention to the space underneath can help an elevated project contribute to more of the neighborhood.
The authors also explored a Paris skyway concept that combined habitation, public space, pedestrian movement, solar access and urban agriculture. Their experiment used a superblock of 16 blocks and 194 buildings, and evolved 1,250 phenotypes across 50 generations. Those numbers describe a computational design study, not a built project or a measured outcome. The research is relevant because it treats an elevated layer as a network with multiple urban and environmental aims rather than as an isolated bridge.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Are vertical cities sustainable?
They can support sustainability goals, but vertical density is not inherently greener. The outcome depends on the full project and its relationship to the city: how people travel, what uses are colocated, how the building responds to climate, what materials and construction are required, and whether its spaces are accessible and useful.
The potential benefits identified in the Energies review include greenery that can support temperature regulation and biodiversity, and multifunctionality that may reduce some journeys. Dense development can also help limit sprawl and transport burdens, a point made in the CTBUH paper. These are plausible advantages when the surrounding infrastructure and everyday routes make them real. A garden that is inaccessible, or a mixed-use tower that does not connect well to transit and nearby streets, may contribute less than its headline features suggest.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThe trade-offs are substantial. The Energies review identifies human-scale adaptation, construction and material costs, design complexity, environmental impact and urban microclimate among the constraints. A tall, highly serviced project can involve complex construction and coordination; the Energies review does not justify treating height as a universal way to reduce environmental impact. Nor does a planted façade or a high-level garden establish how the whole project performs across construction, operation and its urban setting.
Social sustainability is part of the calculation. The Geography Compass review identifies equity, security, stratification and uneven access as central issues in vertical urbanism. Shared areas can be physically elevated but socially restricted; a polished public realm can be privately managed; and a major redevelopment may change who can remain in the neighborhood. A responsible assessment therefore asks who owns and operates the space, who is welcome, who benefits and who may be displaced—not only how much greenery or floor area is provided.
Also popular on Amazon
- APPLY TO MOST DRILLS : 6 pieces screw extractors work with any drill and all the screw size or bolt (3-12mm), These extractor tools are used to reverse the damaged screw counterclockwise until it is released
- The DIY Tools for Men-Men won't know they need screw extractor set until they have one! This screw extractor set is GIFTS WRAP AVAILABLE, can be gifted to your loved ones as it reflects a fresh trend with fun and practical. Amazing and Unique tool gifts for men women. The must have stocking stuffers for men, gifts for dad, husband, father, him, guy teens, adult, Boyfriend, son on Birthdays, Christmas, Fathers Day or anniversary. Perfect Holiday Gifts Guide
- HIGH QUALITY - This damaged screw remover tool kit is made from High-Speed Steel H.S.S 4341# , which have high hardness of 63hrc, it's durable and easily to remove any damaged screws.
- EASY TO USE: Just two simple steps to get the job done - drill a hole with a cutting size using the right size screw extractor and easily remove the screw or bolt using the removal tool Hardness 63-65HRC: Titanium hardened steel material, more durable than most screw extractors on the market, better hardness and durability than others, buy with confidence and complete peace of mind
- Cool Gadgets for Men Dad Christmas Birthday Gifts for Men and Women - Men won't know they need screw extractor sets until they have one! Every screw has the potential to rust and break, which can create a situation where it cannot be removed. Owning it, there will be no anxiety about rusty screws. This screw extractor set is GIFTS WRAP AVAILABLE, can be gifted to your loved ones as it reflects a fresh trend with fun and practical. Amazing and unique tool gifts for men women. A must have stocking stuffer for men on birthdays, Christmas, Father's Day or anniversaries, a gifts for dads, husbands, fathers, him, adults, boyfriends, sons. The best and most practical and surprising Christmas gifts
What should project teams ask before calling a project a “city in the sky”?
The phrase is most convincing when a project supports connected everyday life across levels, rather than using a skyline image to imply urban completeness. For owners, designers, contractors and public agencies, the following questions help turn the idea into a practical brief.
- Does the program meet daily needs? Identify the destinations that matter to residents, workers and visitors, and check whether their hours and routes make the mix useful.
- Can people move through the project clearly? Trace connections among the public street, transit, building entrances, shared areas and elevated or underground levels. Look for routes that are legible and usable, not merely present on a plan.
- What does “public” mean here? Define access, hours, costs, rules and management responsibilities for each shared space. Distinguish an open civic space from a privately controlled amenity.
- Does the design work at human scale? Consider daylight, shelter, orientation, rest, social interaction and the transition between indoor and outdoor areas.
- What environmental benefits are supported by the design? Examine planting, water, energy, ventilation, solar exposure, materials and microclimate together. Avoid treating one visible feature or certification as a complete sustainability finding.
- How does the project affect the existing city? Consider neighborhood access, transit, heritage, displacement and the quality of the street-level environment, including spaces beside and beneath elevated infrastructure.
- Can the system adapt? Consider whether its spaces and connections can respond to future changes in population, climate, transport and technology.
These questions keep the focus on a project’s performance as part of an urban system. A vertical development earns the “city” label not through height or a collection of uses alone, but through the quality, accessibility and governance of the relationships among those uses and the city around them.
Recommended Free Tools
Frequently Asked Questions
What is the difference between a vertical city and a megatall skyscraper?
A megatall skyscraper is classified by its height, while “vertical city” describes an urban way of organizing functions and movement across levels. A project can be exceptionally tall without providing the connected public spaces, daily destinations or links to surrounding streets that the broader idea implies.
Are skybridges useful in cold-climate cities?
Enclosed building-to-building skyways can provide elevated pedestrian connections in cold-climate settings, but their usefulness depends on how they fit into the wider walking network. If they bypass street-level destinations or have limited access, they may improve a route for some users while weakening the connection to the public realm below.
What does the Paris skyway study’s “1,250 phenotypes” refer to?
It refers to design variations generated in the study’s evolutionary urban-form experiment, not to 1,250 built projects. The researchers applied the process to a superblock of 16 blocks and 194 buildings over 50 generations.
Can a privately managed garden still count as public space?
It may provide a shared amenity, but its public character depends on actual access and control: who may enter, when, at what cost and under whose rules. Those conditions can differ substantially from a civic space open and managed for the public.
