If this is not the case in your state or you have done so, then I would serve them a "Non Renewal of Lease Notice".

Everyone always touts "commissions are negotiable" -- I've heard agents here and across the country assuring sellers this is the case. In

That may not be the case in say Amarillo.In an urban context, containers make more sense in infill lots in cities with high land and labour costs.Austin city treats containers no different from new homes.

Worst case in real estate does not equal 100% loss.  

This is also the case in HOA's or Condo Associations where it is often times written into the Rules and Regulations or CC&R's.Probably not worth it to risk getting caught in those instances.That being said, there are plenty of people who do this whether they have permission or not, and there are some landlords who will allow it.

There is even a case in court right now that is challenging the minimum income threshold of "3 times monthly rent" as discriminatory. 

I think it would be hard to show a hardship in this case in my municipality. 

Hardly the case in a scenario where the units need work and/or the tenants are not paying market.

How they react to request of 3 months rent, in your case, in the beginning is really best indicator of their finances, even better than credit reports.

I would expect the fact you are a real Estate Agent will NOT help your case in any actions, as you are a Quote "PROFESSIONAL" Unquote in the field!