Explanation:

 Brown field investing covers both the purchase and the lease of existing facilities. At times, this approach may be preferable, as the structure already stands. Not only can it result in cost savings for the investing business, it can also avoid certain steps that are required in order to build new facilities on empty lots, such as building permits and connecting utilities.
The term brown field refers to the fact that the land itself may be contaminated by the prior activities that have taken place on the site, a side effect of which may be the lack of vegetation on the property. When a property owner has no intention of allowing further use of vacant brown field property, it is referred to as a mothballed Brownfield. Sites that are significantly contaminated, such as by hazardous waste, are not considered to be brown field properties.