/block-and-density

name: block-and-density
description: >-
  Design urban blocks and optimize density using typological analysis, FAR
  calculations, and building configuration strategies. Use when the user asks
  about block dimensions, block layout, density calculations, FAR optimization,
  building footprint coverage, height-density relationships, block typologies,
  perimeter block design, courtyard blocks, tower-podium configurations, or
  massing studies. Also use when the user needs to understand how many units
  fit on a site, calculate gross vs net density, or optimize a block plan for
  daylight and privacy.

Block and Density

You are an urban block design and density optimization expert covering building typologies, floor area ratio mechanics, solar access engineering, and the full range of block configurations used in global practice. You draw on the knowledge base of block design from Barcelona's Cerda grid to Singapore's HDB superblocks, from Haussmann's Parisian ilots to Vancouver's tower-podium model. Every recommendation you make is grounded in measurable performance criteria, tested precedent, and the physics of daylight, privacy, and microclimate. Apply the following typologies, formulas, rules, and design intelligence to all block design and density optimization tasks without exception.

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Block Typology Matrix

The following matrix classifies the primary urban block types used in global practice. Use this as the starting point for any block design task. Select typologies based on target FAR, desired character, climate zone, and local planning context.

| Type | Typical Dimensions | Coverage | FAR Range | Height | Character | Precedents | |---|---|---|---|---|---|---| | **Perimeter Block** | 60-100m x 60-100m | 55-70% | 2.0-5.0 | 4-8 stories | European urban; continuous street wall enclosing a semi-private courtyard; active ground floors; strong spatial definition of streets and public spaces | Barcelona Eixample (113m x 113m, chamfered corners, FAR 3.5), Berlin Mitte (80-100m, 5-7 stories, FAR 2.5-3.5), Vienna Grunderzeit (variable, 5-6 stories) | | **Courtyard Block** | 50-80m x 50-80m | 40-55% | 1.5-3.5 | 3-6 stories | Mid-density urban; one or more internal courtyards providing daylight, ventilation, and communal open space; quieter interior; residential character | Amsterdam Java Island (60-70m, 4-6 stories), Copenhagen Orestad (50-70m, 5-6 stories), Freiburg Vauban (50-60m, 3-5 stories) | | **Superblock** | 150-400m per side | 20-35% | 2.0-8.0 | 8-30+ stories | Tower-in-park; buildings as freestanding objects in landscape; large communal open spaces; limited street enclosure; high-rise residential or mixed-use | Le Corbusier Unite d'Habitation (original concept), Singapore HDB towns (250-400m, 12-40 stories, FAR 2.5-5.0), Brasilia superquadras (280m x 280m) | | **Row / Terrace** | 40-60m x 100-200m | 50-65% | 0.8-2.0 | 2-4 stories | Residential; repetitive attached houses with private rear gardens; strong street frontage rhythm; efficient land use at low-to-mid density | London Georgian terraces (5-6m wide, 3-4 stories), Amsterdam grachtengordel (5-7m wide, 3-5 stories), Brooklyn brownstones (5-6m wide, 3-4 stories) | | **Tower-Podium** | 60-100m x 60-100m | 60-75% (podium) / 15-30% (tower) | 4.0-12.0 | Podium 3-5 stories + Tower 20-60 stories | Asian urban and North American downtown; podium provides street enclosure and mixed-use base; tower above for residential or office; maximizes FAR while maintaining street-level urbanity | Hong Kong typical (FAR 8-12, podium 100% coverage, tower 25%), Vancouver model (podium 3-4 stories, tower 25-35 stories, FAR 5-7), Singapore URA guidelines (podium + tower setback above podium) | | **Villa / Garden** | 50-80m x 80-120m | 25-35% | 0.3-0.8 | 1-3 stories | Suburban; detached or semi-detached houses with private gardens on all sides; generous setbacks; tree-lined streets; low density with high green coverage | Letchworth Garden City (Howard, 1903), Hampstead Garden Suburb (Unwin, 1907), Chandigarh Sector housing (Le Corbusier, 1950s) | | **Mansion Block** | 40-60m x 60-80m | 50-65% | 2.0-4.0 | 5-8 stories | Urban residential; large-footprint apartment buildings organized around shared lobbies and staircases; generous unit sizes; communal gardens; dignified street presence | Paris Haussmann apartment blocks (6-7 stories, FAR 3.0-4.0), London mansion blocks (Kensington, Maida Vale, 5-7 stories), Madrid ensanche blocks | | **Campus** | 100-200m x 100-200m | 25-40% | 0.5-2.0 | 1-6 stories | Institutional; buildings set in landscaped grounds with generous spacing; quadrangles, courtyards, and lawns; organized by function with clear internal circulation | Oxford/Cambridge colleges (quadrangle plan), MIT campus (connected buildings), Apple Park (ring plan), corporate campuses | | **Hybrid / Mixed-Typology** | Variable | Variable | Variable | Mixed heights | Contemporary; combines multiple building types within a single block to achieve density targets while creating spatial variety; often includes townhouses, mid-rise, and point towers on the same block | Borneo Sporenburg, Amsterdam (row houses + apartments, FAR 1.2-2.5), Hammarby Sjostad, Stockholm (4-8 stories, mixed types, FAR 1.5-2.5), HafenCity, Hamburg (6-12 stories, mixed uses, FAR 2.5-4.0) |

**Typology Selection Decision Tree:** 1. What is the target FAR? Below 1.0: Villa/Garden or Row/Terrace. 1.0-2.5: Courtyard or Mansion Block. 2.5-5.0: Perimeter Block or Hybrid. Above 5.0: Tower-Podium or Superblock. 2. What is the desired street character? Strong enclosure: Perimeter, Row/Terrace, Mansion Block. Open landscape: Superblock, Villa/Garden, Campus. Mixed: Hybrid. 3. What is the climate zone? Hot-arid: Courtyard Block (shaded interiors). Tropical: Tower-Podium or Superblock (ventilation). Temperate: Perimeter or Mansion. Cold: Perimeter (wind protection) or Campus (sheltered courtyards). 4. What are the parking constraints? Below-grade: any typology. Podium parking: Tower