There are differing lender requirements used to determine whether a loan will be granted with a certain LTV. It's quite common for owner occupied residences to get loans at an LTV of 80%. However, when a property is to be an investment, lenders will frequently require higher LTV's.
$240,000 mortgage on the property.
$240,000 / $300,000 = .80 or 80% Loan to Value Ratio

