Brownfield: Brownfield is the term used to describe a land plot where a real estate development project is taking place where there are significant existing buildings or other previous development (in constrast to a Greenfield site). The presence of existing buildings may provide benefits to the development in the form of on-site connections to required utilities, roads and other infrastructure. Also, because the existing buildings will have a specific permitted use, the uncertainty, time and cost of permitting for the new development may be reduced (assuming it does not require a change of use). However, existing buildings may also be a source of polution / contamination and/or other conditions that must be dealt with in order to proceed with the development. In the United Kingdom the term Previously Developed Land (PDL) is also used. In the United States use of the term Brownfield usually indicates the existance of contamination.