Google's keywords tool usually does a decent job of suggesting other phrases and terms. You are using the keywords tool, right? If would try words like "apartments, condos, houses, etc.." I have found similar issues with local terms using the keywords tool (no traffic). You can also get some help by playing with  the auto-complete on Google's search bar but it's more vague..also try looking at page source of your competition to see what they are optimizing for, especially in the meta keywords field.