Hi John
The Python snippet below (requires ArcInfo 10) finds parcels that have neighbouring parcels greater than a certain area in size. I'm not sure from your post your exact requirement for selecting parcels, but you should be able to monkey with the logic to get there.
Regards
import arcpy
arcpy.env.overwriteOutput = True
parcels = r"C:\Temp\Parcels.shp"
lines = r"C:\Temp\Lines.shp"
arcpy.PolygonToLine_management(parcels,lines,"IDENTIFY_NEIGHBORS")
bigParcelList = [p.fid for p in arcpy.SearchCursor(parcels,"shape_area > 12000")]
hasBigNeighbourSet = set([l.right_fid for l in arcpy.SearchCursor(lines) if l.left_fid in bigParcelList] + \
[l.left_fid for l in arcpy.SearchCursor(lines) if l.right_fid in bigParcelList])
hasBigNeighbourSet.remove(-1) #any parcels on the edge of the world
bigneighbours = r"C:\Temp\BigNeighbours.shp"
expression = "fid in " + repr(list(hasBigNeighbourSet)).replace("[","(").replace("]",")")
arcpy.FeatureClassToFeatureClass_conversion(parcels, r"C:\Temp", "BigNeighbours.shp", expression)
