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In many areas, especially inner-city areas, land is expensive and there is limited space available. A lack of space may mean that building detached houses may be impractical and expensive, so smaller houses are build together.
The main solutions to a lack of space are:
- Building connected houses, often built in horizontal rows along a street and in columns on top of each other. Brownstones, Townhouses or Duplex houses are examples of these.
- Single buildings of apartments may be built. Each apartment is a small housing units, often in large buildings in inner city areas or areas where space is limited or heavily demanded.
- Building penthouses on top of current multi-story buildings, especially apartment buildings.
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