Also, what is the equity in the property?

This would likely take coordination with a tenant at some point - (ie - plenty of notice to them that they must vacate in order for you to sell the property)Since your current home is free and clear -  you could do a cash out refi or take out a new mortgage on the new house to be able to buy your paren't house and pay off the mortgage.  

Several years back, this was the expansion from Queen Creek, which was the expansion from Gilbert, Which was the expansion from Chandler and Mesa....you get the idea. 

I highly recommend the book real estate by the numbers.

If you feel the agent mislead you or rushed you to sign off, you may be able to file a complaint.

You know the old saying, "location, location, location."

Is the line of credit different from refinancing the home that is free and clear? 

We built the system the way we did for very specific reasons.

Now, seems like a simple task- take the old door off and put a new door on.

To the bank it's a good deal because there's 40% equity in the property.