But, I saw an identical unit with the same floor plan in the same complex on Craigslist rent for $2750 so I figure the market rent is about $2750.

It's like finding a needle in a haystack just to locate the target property...and then you need to find at least 3 other almost identical, sold "comparables" to prove your good deal and current market price...and still be at least 30% below fair market value for nearby residential listings (on top of deducting necessary repair expenses), and at least 40% for an REO...and don't think you can submit a deal for vacant land, commercial or anything else that is not a standard family residence.

- What extension fees do you charge if the loan goes past maturity?

Come Q3 this year, I will have 300k plus cash from various options that will mature.  

The instrument will only have the original loan amount and maturity date in most cases.

Last year when Amazon built a 1 million square foot center here home prices went up a lot.I am hoping this corrects the recent downturn, this means there will be quite a few management people from that center looking for nice homes in the area to buy.There has also been talks of another 1.5 million square foot facility being built soon but they always keep the identity of the place secret until they are ready to break ground.

There are 4 more 4 plex's for sale on the same street that are identical.

I was thinking of possibly taking out ~$50k which would make my monthly payments almost identical to what they are now. 

The floorplan is identical minus a 4th bedroom where I have a loft...

. - to prospective borrowers (please disclose if there is a better way of structuring this).1- We have been told that 10.75% APR and 2.5 points is a competitive rate - in the current market, would it be feasible to exceed those returns at 60% LTV/6-18 months maturity?