Architecture & Urban Planning

19 domain-specific abstractions whose origin domain is Architecture & Urban Planning.

• Adaptive Reuse — Retain an existing building's physical substance — structure, envelope, site, silhouette — while replacing the function it serves, fitting a new program into the inherited constraint envelope rather than designing a building around the program.
• Complete Streets — A transportation doctrine that designs a fixed-width road corridor for a declared portfolio of all users — pedestrians, cyclists, transit riders, freight, drivers — allocating the right-of-way as a zero-sum choice and auditing it by multi-modal level of service.
• Defensible Space — Configure a built environment — sightlines, threshold cues, a public-to-private zone hierarchy — so each shared space reads as an ownable territory attached to a small resident group, recruiting cheap recognition-based surveillance in place of paid policing.
• Downs–Thomson Paradox — The transport result that equilibrium car travel time is set not by road capacity but by the quality of the parallel transit alternative — because expanding roads bleeds ridership, degrades patronage-elastic transit service, and pushes riders back until the road re-congests.
• Form-Based Code — Regulate land by the physical form of buildings and their relationship to the street — height, setback, build-to line, frontage type — instead of by use, making relational geometry the controlled variable and leaving activity open by right.
• Imageability — Kevin Lynch's property of a physical environment that lets inhabitants build a vivid, navigable mental map of it, decomposed into five element classes — paths, edges, districts, nodes, landmarks — plus the integration that binds them into one coherent image.
• Infill Development — Direct new construction to vacant or underused land inside the existing serviced area rather than extending the urban footprint outward, treating already-built infrastructure as sunk capital that added density amortises, and scoring the choice on servicing cost, driving, and edge land conversion.
• Missing Middle Housing — Name the absent band of small multi-unit building types between detached houses and large apartment blocks as a regulatory artifact of single-family zoning, making the bimodal housing stock a diagnosable problem with an enumerable reform target.
• Mixed-Use Development — Keep a district alive across the whole day by co-locating complementary land uses whose activation peaks stagger to cover the off-hours, tuned through frontage allocation.
• Pedestrian Shed — Measure the true reach of a transit stop or destination by counting who can walk to it within a time tolerance along the actual street network, not the straight-line circle.
• Placemaking — The urban-design discipline that transforms a physical space into a recognised place — a location residents name, return to, and weave into routine — by treating place-quality as emergent from four mutually reinforcing loops (physical form, patterns of use, collective identity, and community stewardship) rather than as a property of design alone.
• Road Diet — Intentionally reduce a street's vehicle capacity and reallocate the recovered right-of-way to other uses — the classic four-to-three-lane conversion — because the throughput-maximising configuration sits below the joint optimum across safety, retail, and pedestrian function.
• Space syntax — Represent a spatial layout as a graph of sight-and-movement lines and compute centrality measures like integration and choice, so a space's pedestrian use, vitality, and encounter rates are predicted from its configurational position rather than its local design.
• Tactical Urbanism — Install a low-cost, short-duration, explicitly reversible version of a proposed public-space change so the demonstration both generates before-and-after evidence and lowers the political stakes of committing — feeding a commit-or-remove decision.
• Third Place — Name the category of semi-public gathering venue that is neither home nor work, and test whether a setting truly functions as one against eight characteristics — neutral ground, regulars, conversation over turnover — separating social function from mere built form.
• Urban Heat Island — Explain the persistent urban-rural temperature offset, especially after sunset, through heat-absorbing materials, thermal storage, reduced evapotranspiration and ventilation, canyon radiation trapping, and anthropogenic waste heat.
• Urban Sprawl — The metropolitan growth pattern defined by a conjunction of four attributes — low density, single-use separation, car-dependent connectivity, and leapfrog geometry — that together make a settlement form diagnosable, measurable, and addressable by attribute-specific policy levers.
• Walkability — Score how well a built environment supports travel on foot by measuring two conjunctive halves — whether daily destinations sit within walking range and whether the paths between them are safe and continuous — so a low number points at the binding deficit.
• Zoning — Partition a jurisdiction's territory into spatially bounded districts and assign each a fixed rule bundle of permitted, conditional, and prohibited uses plus dimensional standards, so what may be built at any parcel resolves by a two-step map-then-ordinance lookup.