Accounting for 3 months vacancy, that's $36,000 a year.  

What considerations do I need to take into account here?

Your conventional lender is going to verify the source of your down payment and it will need to be in your bank or brokerage account for two statements.

You do accounting for others.

We have no intentions of withdrawing any funds from our llc bank account until after tax time so that we can get a good feel for the tax implication in relation to our individual income from our primary careers and, neither of us currently need the money to go back to our respective pockets so we intend to roll it all back in to more houses/flips etc.. 

At the beginning I got an acceptance from the bank to take a loan as an individual for a mortgage loan with a 4% interest this is like starting with no company which will get me with fewer expenses for the beginning (lower mortgage payments, no need to start a company and pay monthly an accountant for this but I cannot count any expenses that will be made in my investment, my country gives a standard 5% deduct on individuals so let's say my annual income is 10000€ , I got to pay 10000-5% = taxes for 9500.) 4.

Commercial real estate was much more appealing, probably due to my accounting background that allowed me to have an in-depth understanding of the nuances of commercial real estate. 

Most of the time conventional is the way to go as long as you have 5% plus closing costs in your bank account.

I would account for ~$80-$125 per square ft for a GC to handle the construction depending on the level of finish.

Another option is perhaps less attractive but if the money is added to your account over a couple of months and for a couple of months, you wouldn’t have to explain where it came from.