@Shawn M Hannan The CHA site is a good site to learn their process. 

My personal opinion is you should maneuver your way to get in front of the owners of the company you work for.

This is a pretty weird question, I know, but I am curious.I get that you can do deals pretty much anywhere, and there are good deals all over the country, but I don't believe that the markets are equal in this regard.For example, if the seller has the ability to look at your credit as an investor (which throws out one of the sole purposes of doing a seller finance), versus states/markets that don't require that as much, I would like to know the states/markets where owners checking your credit history is not going to be prevalent in a deal, assuming the seller is willing to do this kind of deal with you.For context, yes, I am a new and aspiring investor, and due to certain circumstances, my credit is currently not the best, but I don't want that to stop me from investing in real estate (which is why I'm leaning to using seller financing).Please no answers saying that I should just raise my credit score and get an FHA/Conventional loan, because I am currently working on raising my credit, but I can't give a time on when my credit will be "back to normal" again, which could mean I could be stuck on not qualifying for a loan for the next couple of years (ain't nobody got time for that).Thanks for the help!

I currently own the property with another person who does not live on-site but receives profit. 

Occasionally you might find an investor/owner with a vacant house that puts a Rently box on or some kind of combo, but most of the time you will need a realtor to escort you. 

The previous owner left the house completely full of belongings.

There is a STR group in Atlanta called AMSTRA stands for Atlanta Metro Short Term Rental Alliance led by @Rich Munroe, he is very active and worked very closely with the city while designing STR to present owners side of the concerns.

Maybe you can report the owner to Code Enforcement or similar department?

You can also access this apartment from the main entrance that has stairs going down to the apt; so it has a front and back entrance.https://www.nyc.gov/site/hpd/services-and-information/basement-and-cellar.pageMy father is getting older and he just doesn't want to deal with the house anymore, and will be passing it down to me.

Everyone within that LLC theoretically is the "owner" of the property.