Lenders have started to loosen their underwriting standards for jumbo mortgages in an effort to increase originations for borrowers who have performed exceptionally well in recent years. Loan-to-value ratio requirements in particular have loosened, allowing for lower downpayments or increased use of second liens. After the non-agency mortgage-backed security market collapsed in 2008, combined LTV ratios of 70 percent were common for jumbos as lenders looked to prevent pricey foreclosures on ...