I have a tenant who is suing myself and my property manager for claims of negligence and inhabitability.

If you are not completely negligent, there are very few reasons why they will bother to chase your personal assets with a umbrella sitting there.

In my lease it states:"Tenant shall be responsible for damages caused by her negligence... of both the leased room and common areas subject to tenants use.

There's been no, or a negligible decrease in prices? 

Using property management doesn't relieve you of liability nor the PM negligence.

Putting a lock on the property essentially opens to theft, negligence and a potential lawsuit. 

If you take care of your properties and are properly insured you won't need the protection of an LLC, however, if you have an LLC and are negligent, a good attorney will be able to "pierce" the LLC and go after you personally anyway.I spread my properties out because I have different goals with each of the separate businesses and I want some privacy.

Asked about the issue of corporate veil and told the owners are sued normally for personal negligence, hardly ever for piercing the veil.Reason for my interest and concern is I bought a business that I placed in the LLC from an owner who had it in his S Corp, and was sued for $3 million.

The only way they would pay with me is if their negligence or silliness caused the damage. 

Their sales director, Tyler Fenn, and their chief executive Mark, for whom this outfit refuses to provide a last name, are negligent and contemptuous in the extreme.