Locations

While editing for my internship, a question arose: do I capitalize terms such as Eastside, Westside, etc.? The rule for cardinal directions seems to be that the lowercase is used if the directions merely indicate direction (ex: Honolulu is south of Waimea) and capitalized when they refer to places (ex: the South). My guess would be that the terms "Eastside", etc. refer to proper places so they should be capitalized?