According to the 2020 report, England has 182,000 brownfield sites — the equivalent of 64,247 acres — that can sustain more than one million new homes. America has an estimated 450,000 brownfields that could be redeveloped to support new housing. The restoration of these sites will improve local property values and help increase the tax base of municipalities. But brownfield redevelopment can be fraught with problems, a deterrent for investors and developers.