Equity stuck in property and I want to continue investing

[Stephen Nava]

I own three properties. One has about $280,0000 equity that I would like to use to continue investing. Due to my high debt to income, I am not able to qualify for a refinance.

Monthly Income: 

W2 2426

Property 1 Rent 2200

Property 2 Rent 2700

Total monthly income: 7326

Expenses: 

Property 1 Mortgage 1306

Property 2 Mortgage 2177

Property 3 Mortgage 1284 (This is a co-sign loan)

Total monthly expenses: 4767

Besides selling the property with the high equity, what are options or strategies I can use to continue growing my portfolio?