Is there a cap on how much you can increase it? 

I am paid a percentage of profit on the rehab projects once the project has been sold (minimum of $1k that was paid at closing): 10% up to $15k in profit, 12.5% up to $20K, and 15% for anything higher with a cap of $4K Commission.• Rentals: I am paid $1K for C-Class rental acqustions, $1.5K for B-Class, and $2K for A-Class.

Most mobile home park buyers want to pay a cap rate that is around 3 points higher than the interest rate on the loan.

Your definition of a Cap Rate is incorrect.

But even if I could, you have a cap (is it 4 now?

You also don't get a cap gains exemption if the property you're selling isn't a primary residence that you lived in for 2 of the last 5 years.

The property, with an all-cash offer, could get a Cap Rate of 8.3%, a COC ROI of about 5.99%, and would cash flow well enough with about $415 per unit.

@Jason Miller, credit unions and local/major banks have put a cap on HELOCs after the refi boom slow down. 

There is also a cap on the increase, even w/ banked rents.

Most states have a 'cap' on what the investor is able to earn but when you have multiple investors bidding on the same property, it is typically a matter of who is willing to accept the lowest rate of interest which may often get very low to 0.