It sounds like the city ignored a lot of complaints about structural concerns from tenants for years, which is concerning.

Basically, your question does not have a generic answer.Here's some reading to start:https://www.biggerpockets.com/forums/51-tax-legal-issues-con...https://www.biggerpockets.com/forums/51-tax-legal-issues-con...

Mold is a common complaint from tenants, particularly those trying to exploit you.Mold is everywhere, even in the air we breathe outside every day.

At a bare minimum, I would consider filing a complaint with the state licensing board, but only if you have written evidence (email, text, letter, etc.) showing that you instructed them to install security and they failed to follow your instructions.

"Every Landlord's Legal Guide" by NOLO is a good book for this purpose.

From my employer, I have legal insurance through ARAG that covers 100% of attorney fees when buying a primary residence, filing fees are extra.

I am fully aware this is not a legal advice forum, but just looking to hear what other landlords have done in this situation. 

Actually, YES, not only MAY the act of simply showing a property factually create "procuring cause" and be inclusive of a protected list, BUT just the action of having sent an e-mail of the listing, client having opened and seen that listing, not ever setting foot on premises, YES, that alone CAN be "procuring cause" and LEGALLY include such property into a protected list. 

The company hesitated to proceed with any further legal action and asked me to give them some time.

Applying the same criteria consistently helps protect you legally.2.