Possible Clues:

• Real-estate ad abbr.
• Realty ad abbr
• Cellar, in realty ads
• Rm. w/o a view
• Realty ad abbr.
• Cellar, in real-estate ads
• Cellar, in want ads (Abbr.)
• ''Finished'' rm.
• Cellar: Abbr.
• It may be finished, in an ad: Abbr.