Quote from @Chris Lo: Which platforms/websites do landlords use to find the rent rate, how long the rental properties have been on the market, and all the details about other rental properties?

Quote from @Charles Evans: There are websites that estimate market rent, but they can be off quite a bit.

I tried to go to the website referenced, but it gave me a 404 error.

I am basically looking for a cashflow property in the Lehigh Valley or anywhere else, but I would love to visit the property as I am staying in the NJ/NY region.

Networking with local investors and visiting potential markets can also give you valuable insights.

Tampa was my most visited place which is why I moved there.

We've decided that we'll likely look for something somewhere in Guanacaste because we want beach AND proximity to airport (LIR).We go each August to visit her family. 

If your local municipality has an online court records, go to their website and look up both criminal and civil histories.

She has a deep understanding of the local markets and can help you identify properties that align with your goals.I’d be happy to set up a call to discuss your plans in more detail and share insights about neighborhoods, strategies, and what to expect when you visit.

For example, to get up-to-date property tax data you would need to scrape every county's tax data website (thousands of different websites, data formats, issues, etc...) then aggregate and clean the data.