The exponential growth works twice as fast if you start with 100%, instead of 50%.Have you read what @Billie Miller did by living in a duplex (house hack)....I don't believe they needed a partner?

As the owner of the property you are able to pick up.As for changing the designated GC, you submit a letter to L&I stating you are changing contractors to the plans examiner who handled the permit and they will change it for you. 

They will either come across as a professional, and ask logical questions, or they will talk fast and ask silly questions.

That also might change some things too.  

@Antoine Martel - thanks for the super fast response!

Especially with fast-food...while many argue KFC and McDonalds will never go out, what if they do?

@Mitch P.Yes, you can cash out for the full amount of LTV that the lender requires - some require 75% and some allow 80% - also, a lender that allowed 80% may require 75% on another deal if your personal situation changes - debt to income, etc.The deals are out there - I am constantly on HAR looking at my target neighborhoods - I also have automatic notifications set up when a new property comes on the market that meets my criteria.

Finally, contacting some of the providers who regularly provide information here can really fast track some of your due diligence and allow feedback to be tailored to your situation.

Then you can always go change the combo at your convenience.  

Also, you need to be aware that if you continuously accept partial rent, say 3-4 months in a row, you may tacitly change the due date of the rent based on the arrangement, which could ruin an eviction if you demand the full amount based on the written rental agreement grace period.