Hi there!!
I've read through your project description to understand your requirements. I can create you a python script using requests module implementing rotation of proxies within it as zillow is good at banning ips. Once we agree to go on, I'll start working in your project in order to be able to provide you with a robust python script capable of producing a data-ridden csv file.
If I have an opportunity to work on your project, you can rest assured I'll get your job done in a day. Your invitation over a private chat would be highly appreciated.
Regards,
Md. Shahin Iqbal