The filing for the county is a COA  not HOA which is very confusing for owners and investors.  

However, you really only need to have the septic inspected if you are purchasing a mobile that will stay on the property.A septic inspection typically includes a sewer scope, which involves a small camera being fed through the plumbing.

My local RE group is looking at having a webinar with people involved in those businesses to share their experience and that it's not as easy the social media gurus say it is If you haven't already joined a local meet up group, I'd recommend that to help you narrow down your strategy and market. 

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

Hey @Austin Wolff - You bring up some good points about knowing the house better than anyone when you build new if you are actively involved and onsite regularly, but I'd get behind @Jay Hinrichs, in the sense that the numbers don't always allow you to build new.Here in Chicago, new developments are super pricey, and even the BEST DEVELOPERS HAVE SLIM MARGINS. 

If you don't get a rejection, call the agent's supervising broker, if that doesn't help call the State Realtor Association and file a complaint.

It's best to involve a real estate attorney to ensure the contract is legally sound.

I would like to do the state filing myself, because its easy and cheap.

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

@Hoai Nguyen suggest modifying your current lease to cover multi-family setup.Parking, shared access, police report required for landlord to get involved in disputes, etc.