And while nothing is foolproof the most consistent method of finding good vendors is relying on OTHER real estate investors that have worked with those vendors. 

Then there’s city regulations—some places heavily restrict short-term rentals, so you’ve got to check the rules.If you find the right spot and automate stuff (guest communication, cleaning, etc.), it can be profitable.

There are also people who swear by one method or another.   

What are the best methods to independently verify zoning and land use data to ensure compliance with local regulations?

In your thread, you are worried about short-term KPIs like monthly cash flow, yet you purchased the properties to follow the BRRRR method. 

The R2R team was great with communication, providing guidance and insights, and getting me in touch with the proper resources.

I'd send out 500 at a time, using a different mailer/method weekly.

What's the highest success percentage method to find a previous tenant's new address for this? 

Each lender can use their own methods of qualification on commercial properties, and most look mostly at the asset (with the exception of your FICO, experience level and reserves). 

Communication is highly important to me as well.