In the second quarter, first-time buyers needed almost 23 percent of their income to afford a typical entry-level home, up from 21 percent a year earlier.
The company is hoping to avoid millions in losses when the law, designed to police short-term home rentals, takes effect this winter.
Lenders keep fighting to make loans partly because on a national basis, apartment rents continue to rise.
The action against the Pittsburgh-based lender by the U.S. Attorney’s Office in Miami is similar to an inquiry into Wells Fargo & Co. over its purchase of the credits.
The latest project for the Silicon Valley home-rental behemoth is a branded apartment complex in Nashville, Tennessee.