Possible Clues:

• Bldg. units
• Rental units (Abbr.)
• Rms. for rent
• Rental units: Abbr
• Tenants' dwellings: Abbr
• Rental units: Abbr.
• Real est. listings
• Highrise dwellings: Abbr.
• Some Craigslist listings: Abbr
• They may have EIKs