Oops :-o I see the .net and .org are already developed and I was though that realtor is a generic word and not trademarked so I just grab it without any research :P
Lets delete it then..
Nice! So with that combination, what do you use for the first attempt? checking the WHOIS record? if so then how do you deal with the whois server access limitation? I believe that DNS lookup is would be your alternate method as it's not 100% accurate, for example a pending deletion domain will...