I have already built a scraper that works on real estate websites like [login to view URL], [login to view URL], [login to view URL] and Redfin.com.
I have been focussed on scraping the realestate websites since last 3 years. About Me: I am an ex alumni of worlds leading automation software company, currently serving as cloud solutions architect in washington DC. My scrapers are run on a regular basis every week to scrape 1000s of properties from these sites in less than 1 hour time by using amazon cloud. I can also use Zillow API to build the scraper for you, since i am very well versed with Web Based APIs. I recently used RightScale Web API, to create my automated cloud solution. So, i am 200% confident that i can do a better job by creating a scraper with Zillow API.