Possible Clues:

• Abbr. in some house ads
• Rec rm. locale, often
• Cellar, in real estate abbrs.
• Cellar, in a real estate ad
• Cellar, in ads
• Cellar, in classifieds
• Often-finished rm
• Cellar, in ads for apts
• ''Finished'' house room: Abbr
• Place for a washer and dryer: Abbr