Both ways work, require a lot of sacrifice, delayed gratification, sustained focused effort, and patience. 

Any solution for minor sound proofing fixes that may be able to work?

It had never occurred to me that one could be self-sustaining through one's own resources, mainly because I had never made an effort to understand money management, retirement, or finances in general.An MMM blog post led me to BiggerPockets, a forum where the members, sophisticated investors, referred to their properties as "doors."

Once you've proven yourself for a couple years, then you will have everything you need to step out on your own and build a sustainable business quickly.

The financial solution can be self management or a full time manager. 

This method minimized financial risk and maximized efficiency, highlighting Partner Driven's ability to leverage creative financing solutions for successful real estate ve How did you add value to the deal?

The solution going forward is don’t agree to terms with wholesalers that have study periods unless the DD period is reasonable and/or you can still market until the $ goes hard. 

And you have the longer-term solution of REI.

Document EVERYTHING... every conversation, every contact, every document from the remediation company etc etc etc.Then I would send him a certified letter that states all necessary precautions, accommodations and solutions were done.

At that point, it's worth researching and finding a solution that better meets your needs.