Any vendor or chef knows that presentation is everything. Wares require something extra to attract a buyer, rather than shoppers who take a look before passing on. Members of The Partnership for Economic Development in Douglas County are hoping they’ve hit on that certain something for three vacant parcels for sale in the center of the county. What each parcel has secured sounds like a mouthful of bureaucracy: designation as a regionally significant industrial area. The label is more than a collection of syllables, however. It means that state officials have flagged a property as a good location for industrial …