FirstFed Financial Corp., Santa Monica, Calif., said it has promoted  president and chief operating officer Babette E. Heimbuch to chief   executive.   
Ms. Heimbuch will succeed William S. Mortensen, who is retiring after 41  years with the parent of First Federal Bank of California. Mr. Mortensen,   63, will remain chairman of the thrift holding company.   
  
Ms. Heimbuch is to assume her new title Jan. 1. The 48-year-old  executive joined FirstFed Financial in 1982 as chief financial officer,   just before the company converted from a mutually owned savings and loan   association to a public company.     
She has been in her current post since 1989.
  
FirstFed, which has $4 billion of assets, had announced Mr. Mortensen's  plan to retire as CEO earlier this year. 
In an interview Wednesday, Ms. Heimbuch said that FirstFed would remain  a "typical" savings and loan, dedicated to single-family residential   mortgage lending but with an additional emphasis.   
"We will not give up our residential lending focus," she said, "but we  are going to put more emphasis on commercial, industrial, and small-   business lending. Although we are becoming more bank-like, it is going to   take some time and momentum."     
  
The thrift holding company plans to acquire some branches during the  coming year, she added. 
"Acquiring other banks is probably the best way for our institution, or  any bank, to gain knowledge and incorporate different skills into our   culture," she said.   
Ms. Heimbuch added that Mr. Mortensen, who has been chief executive  since 1968, had managed to make the changes needed to help FirstFed grow. 
"He did not stand still and have the thrift become obsolete," she said.  "It is to his credit that FirstFed is one of the few existing thrifts left   standing in this community."   
  
In a statement, Mr. Mortensen said the thrift holding company is well-  positioned for the future and that Ms. Heimbuch's leadership would serve it   well in the years ahead.   
FirstFed Financial has 25 retail offices and four regional loan centers  in Southern California.