I have always used an individual but if I was further away I would want a place that had multiple employees to mitigate risk of someone being sick or otherwise unavailable.  

Getting property out of your name and into a business entity is a great way to mitigate risk, lower personal liability and create collateral as you said.

Who may I contact to find out cost and timelines for mitigating wetlands in FL and how to mitigate (dig a lake?).

Just make sure you talk about the benefits to the community and any plans you have to mitigate any disturbances to your neighbors. 

This case can occur if toxic materials like lead paint, asbestos, etc. used in the previous construction and need to be mitigated.

In order mitigate [1] the irritation and known adverse health effects of secondhand smoke; [2] the increased maintenance, cleaning, and redecorating costs from smoking; [3] the increased risk of fire from smoking; and [4] the higher costs of fire insurance for a building which allows smoking.B) Definitions. [1] “Smoking” means inhaling, exhaling, burning, or carrying any lighted or heated cigar, cigarette, or pipe, or any other lighted or heated tobacco or plant product intended for inhalation, including hookahs and marijuana, whether natural or synthetic, in any manner or in any form.

To further mitigate that risk, we have clients who layer their LLCs with a parent / sub structure which is beneficial for a number of reasons, including scaling a portfolio, entering into to JVs, etc. 

I than built established deals where I or my clients acquire the properties, and we lease to the STR operator on a long term lease deal, there in mitigating there costs of acquiring properties and frees up operational capital for operations and allows greater expansion.

Much like any other investment vehicle is is good to diversify your income streams and help mitigate risk.

The ways to help mitigate that is to use automation software which helps drastically reduce the time involved with an STR, setup a good team (cleaner, handyman, plumber, electrician, appliance, hvac person), and have an exit strategy if short-term regulation does come to that area.