I am not a litigator- I am a "deal" attorney.  

Again, this can vary from state to state and even locality to locality, but the proper procedures for this aspect of the process tend to be spelled out fairly cut and dry in most local civil codes.Feel free to reach out with any questions.

Here are some guidelines as to the state position on brokering without a license:The 2015 Florida StatutesTitle XXXIIREGULATION OF PROFESSIONS AND OCCUPATIONSChapter 455 BUSINESS AND PROFESSIONAL REGULATION: GENERAL PROVISIONSView Entire Chapter 455.228 Unlicensed practice of a profession; cease and desist notice; civil penalty; enforcement; citations; allocation of moneys collected.—(1) When the department has probable cause to believe that any person not licensed by the department, or the appropriate regulatory board within the department, has violated any provision of this chapter or any statute that relates to the practice of a profession regulated by the department, or any rule adopted pursuant thereto, the department may issue and deliver to such person a notice to cease and desist from such violation.

Now, it is possible they won't abide by the lease, in which case you'll need legal help (not the cops, they don't enforce civil contracts, only criminal law and court orders). 

If Arthur does something incorrect in his attempt to collect the big bank upstream has litigation risk for letting, evenetually, Arthur purchase a file he doesn't follow the rules of collection on.

Is this property doomed for litigation? 

He's extremely knowledgeable and minimizes costs (i.e. taking on MEP , civil, and structural drawing scope whenever possible assuming its for minor items that don't require engineering and an engineer's stamp).

It'll be work to litigate later and you'll have no proof of intended harm.

Hi @Abe Macias,I'm a civil engineer here in San Antonio and we do rezonings on occasion.  

I had never met the guy before he approached me to buy his house and she never filed a lis pendens to warn people of the pending litigation.