It does not say “seller to” or “seller agrees to” perform a specific act: it simply states both parties agree to allow the septic design and cost review to be attached to the Inspection Contingency with terms to address cost prior to close.Do you have corroborating written emails that clearly indicate the Buyer has the responsibility to order the design work and estimates?

If you don't like the idea of roommates, then a home with a separate entrance to the basement allows you to Airbnb or short-term rent a space. 

In other words IRS rules don't allow you to sell it to yourself because you are considered Disqualified Person. 

You have to live somewhere.You may need to lower your return or cashflow expectations so you can get into a house hack that will allow you to avoid throwing rent money away every month.

@Michael Moreno When it comes to self directed accounts that allow for alternative asset investing (not all do) it is important to be aware of prohibited transactions and disqualified persons. 

Your budget allows for a balanced approach, spreading risk while tapping into different segments of the local real estate market.Raleigh's real estate market is characterized by its resilience, growth potential, and appeal to a wide range of tenants.

Ideally, it would be something that not only allows to register all the different expenses related to the property and mortgage, but would include the amortization of the mortgage so you can see on the same spreadsheet how much your equity is growing.Thanks

One of the major issues with this type of framing was that it allowed fire to spread through the levels much faster due to the open wall cavities.

First I suggest you find out what is allowed in your jurisdiction.  

I don't see why there should be too many problems with doing something like that except for maybe consider checking with your building department and local zoning if a commercial property is allowed in that particular area that you're residential property currently sits?