Can anybody tell me in what category does the paddy (rice) field would fall under?

And how about if the case is like this: A company owner bought 20 ha paddy field from some of paddy field owners in 2009. Then they alter the 20 ha paddy field into graded land (covered by soil) because they have planned to develop a factory on the land in 2012. So, in LEED project terms, is it consider as previously developed or greenfield?