SAN FRANCISCO — Gordon & Rees is joining the trend in moving back-office operations out of San Francisco. But unlike big firms that have opened centers in the Midwest and Rust Belt—places like Nashville, Tenn., or Wheeling, W.Va.—it chose a closer destination: Oakland.

Due to climbing real estate prices in San Francisco, the firm will transfer administrative staff and its 20-member environmental and toxic tort practice group from its headquarters in the Financial District to a new office in Oakland. Relocating 130 employees on April 14 will allow the firm to shrink its lease at 275 Battery St. from five floors to three, saving about $1 million over five years.