Vacancy Rate & CAP Rate

[Ryan D]

I'm looking to purchase a duplex in an area not far from my home. Seeing as I'm somewhat familiar with the location, I know what rents should be. I also know of several websites such as "Rentometer" and "RentSlicer" which help to further nail down the average rents for an area.

That being said, how do I find the average vacancy rate and cap rate for a specific area? Do I need to call local property management companies? And will they even provide this information to a random caller such as myself? Are there websites out there that will help with my research?