This is a great information source.

First way to approach this is to look at the cost of money from your different sources.  

Source: http://www.businessinsider.com/even-the-laziest-pe...

Once the appraisal comes in, which is always before the Loan Objection deadline, the Buyer has the right to terminate the contract based on the Loan Objection deadline, citing that "in the buyer's sole subjective discretion they cannot get a loan at terms that are satisfactory to them."

I am a big fan of building equity into more than one property so that I always have multiple sources of credit available to me quickly and super cheap (4%)  You could theoretically (if your DTI allows it and you have a decent in come and credit score), take the cash out from the first property and use that for two large down payments on two new houses, then finance the both via conventional financing. 

I didn't quit my job just to lean  solely on this property for income.

If you choose to have an LLC as a sole proprietorship you're not changing much (many advantages only occur in multi-member situations) and some extra umbrella insurance may be a better use of your time and money.

We lend 80% of purchase price. 2 points on the front, 1 point on the back at 9.9%. 600 FICO, No income docs, and funds don't need to be sourced/seasoned.

So when your GC gives you your material bill ask if he is passing on his contractor rebate :-)Often you can get better deals by going to the source... and cut out the middle man.    

I agree that partnering or seeking other sources of funding is a good idea.