This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A piece of industrial or commercial property that is abandoned or underused and often environmentally contaminated, especially one considered as a potential site for redevelopment.

n. A site, to be used for housing or commerce, that has been previously used for industry and may be contaminated or need extensive clearing

"In future, residential gardens will no longer be classified as 'brownfield' - the same category as urban industrial wasteland."

greenfield