The only reason I ask this is after using Investor Carrot you may have build a presence (Brand) on the web using their site and having people go top your IC site and if you decide to cancel their product you will be forced to start over another site to build that Presence on the web again. 

I believe you made the right choice by giving them back atleast something so they wouldn't feel too bad. when it comes to newly mothers having premature labor, they can tie it to the chemicals from the pest control, unless you are using eco friendly 100% natural product, either way it can fall back on you.

The big difference on mine was I didn't have control of the sell and was the mercy of larger group so it made for interesting time lines. 

If the value of my house currently is 510K and I owe 285k what is the most line of credit I can expect?

My other concern is the timing in putting in an offer on a house while trying to line up a renter, but that is probably among the least of my problems. 

In the lending realm, the line is drawn between the 4th and 5th units.

Your first line of defense against loss is going to be insurance on the property, then an umbrella or excess-lines policy on the company. 

At $500 a month rents before expenses in the D-Class space, combined with Owner Financing, and the need to rehab 41 of the 60 Units, and being in a small town of less than 1,600 people, the only thing good that will come out of this deal is that you'll rehab his remaining 41 units for him then somewhere along the line realize you'll never make any money on this deal.   

Not saying it's not possible, but this is likely the hangup. buying cash and then cash-out refi is easy and done all day, even with commercial loans, but likely all will want you to carry some liability in some form (skin in the game) that said, I'm just one lender I can't speak for all of them  Ira or solo 401k are not allow to have recourse loans this is a tough loan product..

Your business entity should own nothing but a check book, land line, business cards and the other 14 requirements to avoid having the corporate veil pierced when a lawsuit comes.