Highland Council said in January that the building work had been a welcome boost during difficult times in the construction trade.

BBC: Funding sought for Scotland's Housing Expo

However, previous attempts to use nanotubes in the solar cell construction process have been difficult because its difficult to arrange the nanotubes on the cell without clumping.

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The proposal would allow up to 200, 000 workers a year into the country to fill jobs in construction, hospitality, nursing homes and other areas where employers say they have a difficult time hiring Americans.

WSJ: Raucous debate on immigration to get under way

"We think residential construction will continue to support economic growth, but it will be difficult to offset weakness in other parts of the economy, like manufacturing, " said Elizabeth Ptacek, senior vice president and real-estate analyst at KeyBank in Cleveland.

WSJ: Stocks Approach Multiyear Highs

"Much of the area in the last decade has been paved over, with new construction, making a search today very difficult, " said Detective Bob Dean of the Alachua County Sheriff's Office.

CNN: College student went for a run, never came back