Multi Family Homes in a County

[Billy Kane]

Hello BPers,

I want to know if there is a way to find out all of the multi family homes for a specific county. 

I know I can send a letter to the county appraiser or go the county website, but does redfin or zillow or any other web application allow you to search to 

on all multifamily homes for a specific county (even the ones that are not for sale)?

Thanks.