Rental and vacancy rate data

[Harry Ng]

Hi everyone, I’m still learning property investment and looking to buy my first property.

Checking out rental properties on Zillow in areas I’m wanting to buy (mainly around Houston TX) I saw most of them were listed 2-3 months ago and kept reducing prices. Wondering if it is a bad sign? (seems like supplies are way more than demands?).

Also wondering if anyone knows where I could find vacancy data etc, as I think low vacancy rate areas would make renting out easier?
Thanks