One of the most powerful tools in the landlord's asset protection kit is the Limited Liability Company.  Unlike insurance, LLCs have no exclusions for mold or other types of liability.

Recently, Los Angeles County courts awarded another large mold verdict.  Here's the verdict as reported in the California Bar Journal:

"Water Damage

Verdict: $859,478

Water damage from a leaking bathtub forced a neighboring tenant from his unit during mold and asbestos remediation..."