I have a considerable amount of equity in the house (HCOL area), and after the renovations are complete we are looking to sell the house in order to use the proceeds to kick start the next venture (flipping).  

We can't really give you a detailed amount of help with out more.Is it in Aurora, CO?

I fix and flip, working with contractors, agents, cash lenders, I sometimes wholesale.

The terms are 5 years fixed at 4.75%.

It is only a good deal for appreciation, there will be no cashflow unless you buy it outright....and for that amount you could a portfolio of cash flowing duplexes in the midwest.So what is the goal?

I have talked to a lot of different ones and have found one that I really like because they have been doing it for twenty years and have vertically integrated property management and construction and a construction warehouse for fixes and everyone is on-staff.

we see it done frequently and have done it but we will not go above 50-60% and require cross collateralization of 3-4x the amount being borrowerd.

Before I begin renting the property what else do I need to consider ensuring the maximum amount of protection via the LLC? 

I am potentially interested in doing a fix and flip with 100% OPM.

My research guided me to form an LLC to hold the properties during repair/rehab (I am buying properties that need major fixing) and move them to another LLC where I will be collecting rent.