Be pushy until you are granted audience.  

I am sure in your lease somewhere it says that the security deposit cannot be used for the last months rent or something to that effect.

Finding, Fixing, and Flipping houses is one way that people are making their way into real estate investing and furthering their financial security.

A close friend of mine brokers over a billion dollars in RE loans annually and was able to secure a 5% 5yr ARM with 80% LTV on this 800k deal for me in October (18').

So an example would be a secured private loan, (secured by real estate a 2nd position on a property or properties), with a 15 year balloon, interest only.

When I wrote to them about it, they responded: "Our Opportunity Fund is filed pursuant to Regulation D of the Securities Act, which requires investors to be accredited." 

May be look into tax exempt securities such as municipal bonds or series EE. 

I meet them and sign the lease and collect security deposit.

As you are house hacking I can see your concern, however, you need to have the business mindset and assess if their filth is causing actual damage that will in turn cost you more money than their security deposit or vacancy time as you clean it up.

Grant - My goal is maximizing cashflow.