Vanderbilt relied on unrealistic expectations of what borrowers would need financially after making their mortgage payment, according to the complaint.

Vanderbilt’s internal model for underwriting loans provided borrowers unrealistic expectations of monthly living expenses, the Consumer Financial Protect Bureau alleged in the complaint.

The U.S. Consumer Financial Protection Bureau sued a unit of Warren Buffett's Berkshire Hathaway on Monday, accusing it of pushing borrowers into unaffordable loans to buy homes from Clayton Homes, Berkshire's manufactured housing business.