Hello,
My name is Rados Nikolic. I am a php programmer, coder and server administrator. I will send you my CV if you are interested to see it, but what I wanted to say is that I already have a project made by me, which is very similar to Zillow and Trullia!
My ex client wanted site same as Zillow and Trullia and we worked on it about 2 months! At the end he closed the project because of the budget.
I have a code and site. I made it in Symfony2 with custom made admin panel, especially designed for our site!
If you are interested to see it, I can set this website on some of my servers and I can show how it looks like and how it works! Of course, if you chose me, we will need to change design completely!
Regarding functions, everything is there, ajax property search, ip locator in order to gives you properties in your neighbourhood, etc..
Best regards,
Rados