If you're going to do it alone, make sure you your due diligence: estoppels, inspection, review, consult with a local attorney familiar with the local regulations, etc. and good luck.

There are a lot of jurisdictions (most of the West Coast now) that include marital status, sexual orientation, and others under their fair housing regulations.

As long as no “healthcare” services are provided (like medication or personal care), it’s not regulated by the Department of Health.

However, there is no specific holding period contained in the tax code or regulations and there is no "safe harbor." 

It's important to stay informed about developments in the areas you're considering, as well as any potential changes in regulations or economic conditions.

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

And the locals in Highlands have been fiercely debating STR's and regulations for the last few years, so I wouldn't be comfortable buying there.

If so do you have any suggestions or tips for best practices to do this?

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