Do you research them ahead of time on Facebook or other social media?

Most retired couple, should be able to  “get by” with 5, especially if they have any other investment< social security or a pension. 

They include: zoning requirements, building codes, impact fees, permitting requirements, design standards, public land requirements, and federal Occupational Safety and Health Administration regulations and other labor requirements.

The use predictive analytics to determine who might sell, they create social ads and online marketing to target them, and they get clicks. 90-95% of these appointments are really for investors because they are built around sell your house quickly and then an agent shows up and tries to list it.

Some investors opt for larger homes with more bedrooms, while others convert existing residential properties to fit more people comfortably, ensuring they meet safety and accessibility standards.One thing to consider—smaller operations like RAL often rely on word of mouth and local reputation to fill rooms, so community engagement and relationships with local health care providers are key to success.PS: Fun fact—by 2030, it’s projected that more than 20% of the U.S. population will be over the age of 65, which makes senior housing a high-demand sector for decades to come. 

I've been approached by a couple of sober living facilities and would perhaps prefer an independent living provider if possible (with 4 units in Cape Coral it's categorized as commercial so all ADA requirements, fire safety, etc. have been provided).

Recommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

I'm the landlord of a 3-unit building and wanted to know if I should be concerned about any potential plumbing issues (like freezing pipes) or other safety concerns.What steps should I take to protect the building, and are there any other things I should be worried about in this situation?

Will be a long road ahead for you all over there, been praying for speedy recovery and safety

All of these have set their sites on Clark-Fulton as an area in need of social and economic uplift and some have dedicated funding to support these efforts.