Land-use planning is often done through the use of alliances. Alliances facilitate the creation of certain types of neighbourhoods as part of a neighbourhood plan. For example, a developer could buy back empty land and divide it into building land. Undified land, which the developer then sells with a series of restrictive guarantees, is paid at a low price. The developer may stipulate in the sale agreement that the owner must retain the original size of a land. Developers can also accept homeowners that homes built on land must be larger than a certain size and include other specifications to ensure that this property will more than likely sell at premium prices, because the neighborhood is desirable. The courts impose such alliances, provided that they benefit and weigh on all property owners in the same neighbourhood. An alliance in the broadest sense and in the historical sense is a solemn promise to participate in or refrain from participating in a particular act. According to the historic English common law, an alliance was distinguished from an ordinary contract by the presence of a seal. Since the presence of a seal indicated an unusual solemnity in the insensitities in an alliance, the Common Law would force an alliance, even if no consideration was taken.  In U.S.
treaty law is presumed a tacit bona fide union. Although the idea of an alliance now seems quite radical, there was a time when alliances were understood much further. Covenants were not always an obscure spiritual or religious concept. Treaties and alliances are not the same thing. Here are some fundamental differences: since 1989, the main domestic alliances that are implicit in England and Wales have been linked to a “limited title guarantee” or “complete” (unless explicitly cancelled):  Alliances can be imposed by owner associations and controversy has arised over selective application.  Historically, exclusionary alliances have been used, particularly in the United States, to exclude racial minorities. Some alliances exist for security reasons, for example. B a bund that prohibits the construction of high buildings near an airport, or an alliance that limits the height of fences/shrubs at street corners (so as not to disturb drivers` sight lines).