How can I keep a home and have cash for next project?

[Bryan Buckingham]

I am hoping that someone knows of a solution that would allow me to hold a home that I own. 

I have lived in my home 2 years. Its value is 1.7 million. Debt on the mortgage is 500k. I built the home and would love to keep it. It would cash flow a few thousand per month. However, my family is looking to buy another vacant lot as a permanent home. I need 800k to purchase the lot and build it out as a residence. My priority is a place for my family so I have to come up with 800k. Are there any other options but to sell? Banks will lend us only a total of 700k because I am newly self employed. Which means I can borrow another 200-250k before being forced to sell our old home. 

Please do comment if you have an idea on this. Selling to an entity that I created crossed my mind, the business would hold a DSCR loan on the properties debt. And our DTI would be free to borrow 700k. However I'm not sure if that's possible with all of the lending rules. Any ideas or insight would be appreciated.