The founder appears to have been involved in businesses outside of real estate: ‘My dream is a locally made grooming products business’ | People | nashvillepost.comSo it does not appear there is a lot of track record there, but those are questions I would ask.

I also make sure to specify in the lease agreement that I need proof of coverage before move-in and that the policy should name me as an “additional interested party.”

Attitude and professionalism are paramount; product knowledge next, and then there's your contact/follow-up systems.Put that together, price-test against the market, and you'll have a sustainable, constantly expanding, and very profitable venture.Good luck! 

What would be my best route to take if we need additional finances?

Curious how this will play out in the courts (granted it's LTR) and affect pricing products used for STR such as PriceLabs (which I use but have to seriously manually adjust for very specific reasons).

In addition, the gas bills have shut off notices and are not being paid. (3 units are occupied and utilities are all paid by owner).

@Dennis KnappJ Scotts book on estimating rehab costs is a great start. https://store.biggerpockets.com/products/the-book-on-estimat...Here is a "general" rule of thumb for my market in Jacksonville, FL.

We're based in Tampa and, in addition to personally investing, I own a mortgage company that provides financing for tons of investors.

Additionally, are there any other factors I should be considering when purchasing a duplex or triplex?

So sad to hear that all the time and money you or your clients invested and the trust you had for Delta Build were lost, in addition to the lost opportunity to otherwise make money.