California mortgage lenders and brokers have obtained a crucial regulatory change in the treatment of yield-spread premiums when determining whether or not a mortgage loan is high cost under state law. The California Department of Corporations announced the change on Feb. 17, which addressed revisions to the state Covered Loan Law that arose from Assembly Bill 901. Enacted in October 2005, A.B. 901 redefined the term “covered loan” by increasing the size of covered loans…